{"id":37720,"date":"2023-10-31T11:54:55","date_gmt":"2023-10-31T11:54:55","guid":{"rendered":"https:\/\/www.wcia.org.uk\/peace-heritage\/international-days\/"},"modified":"2026-03-03T16:31:52","modified_gmt":"2026-03-03T16:31:52","slug":"diwrnod_rhyngwladol","status":"publish","type":"page","link":"https:\/\/cymru.global\/cy\/ein-gwaith\/treftadaeth-heddwch\/diwrnod_rhyngwladol\/","title":{"rendered":"Diwrnod y Cenhedloedd Unedig \/ Rhyngwladol a dyddiadau pwysig i Dreftadaeth Heddwch Cymru ac Actifiaeth Fyd-eang"},"content":{"rendered":"<div class=\"container\">\n<div class=\"tb-button\" data-toolset-blocks-button=\"44136f5bfa01fa8190041926ecdeb57a\"><a class=\"tb-button__link\" href=\"https:\/\/cymru.global\/wp-content\/uploads\/2023\/11\/Diwrnod-y-Cenhedloedd-Unedig-Rhyngwladol.pdf\"><i class=\"tb-button__icon\"><\/i><span class=\"tb-button__content\">Argraffu fel Llyfryn PDF<\/span><\/a><\/div>\n<\/div>\n\n<div class=\"wp-block-image\"><div class=\"container\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"1599\" height=\"1066\" src=\"https:\/\/cymru.global\/wp-content\/uploads\/2023\/10\/United_Nations_Flags.jpg\" alt=\"\" class=\"wp-image-37543\" srcset=\"https:\/\/cymru.global\/wp-content\/uploads\/2023\/10\/United_Nations_Flags.jpg 1599w, https:\/\/cymru.global\/wp-content\/uploads\/2023\/10\/United_Nations_Flags-600x400.jpg 600w, https:\/\/cymru.global\/wp-content\/uploads\/2023\/10\/United_Nations_Flags-300x200.jpg 300w, https:\/\/cymru.global\/wp-content\/uploads\/2023\/10\/United_Nations_Flags-768x512.jpg 768w, https:\/\/cymru.global\/wp-content\/uploads\/2023\/10\/United_Nations_Flags-1536x1024.jpg 1536w, https:\/\/cymru.global\/wp-content\/uploads\/2023\/10\/United_Nations_Flags-1024x683.jpg 1024w, https:\/\/cymru.global\/wp-content\/uploads\/2023\/10\/United_Nations_Flags-2x1.jpg 2w\" sizes=\"(max-width: 1599px) 100vw, 1599px\" \/><figcaption class=\"wp-element-caption\"><em><em>Baneri o wledydd y byd yn hedfan y tu allan i bencadlys y Cenhedloedd Unedig yng Ngenefa, Y Swistir<\/em><\/em><\/figcaption><\/figure>\n<\/div><\/div>\n\n<div class=\"container\">\n<p>Mae&#8217;r dudalen hon yn dwyn ynghyd adnodd &#8216;cyfeirio hawdd&#8217; ar gyfer ymgyrchwyr, athrawon, blogwyr a grwpiau cymunedol ar draws Cymru sy&#8217;n ceisio cysylltu eu gweithgareddau \u00e2 digwyddiadau ehangach yng Nghymru a&#8217;r byd.<\/p>\n<\/div>\n\n<div class=\"container\">\n<ul class=\"wp-block-list\"><div class=\"container\">\n<li>Mae <strong>&#8216;Diwrnodau y Cenhedloedd Unedig&#8217; thematig<\/strong> yn gysylltiedig \u00e2&#8217;u mentrau byd-eang perthnasol. (gan fod cannoedd o arsylwadau gan y Cenhedloedd Unedig, rydym wedi ceisio bod yn ddetholus gan ddewis y rhai sydd fwyaf perthnasol i ryngwladolwyr Cymru; i&#8217;r rhai sy\u2019n chwilio am y Diwrnod Te, Diwrnod Gwenyn neu Ddiwrnod y M\u00f4r Rhyngwladol, chwiliwch ymhellach yng <a href=\"https:\/\/www.un.org\/en\/observances\/international-days-and-weeks\">Nghalendr Arsylwadau&#8217;r Cenhedloedd Unedig.<\/a><\/li>\n<\/div>\n\n<div class=\"container\">\n<li>Mae <strong>digwyddiadau diwylliannol Cymreig<\/strong> mawr fel Dydd G\u0175yl Dewi, Gwyliau ac Eisteddfodau&#8217;n gysylltiedig \u00e2&#8217;u cyrff trefnu.<\/li>\n<\/div>\n\n<div class=\"container\">\n<li>Mae <strong>pen-blwyddi &#8216;Treftadaeth Heddwch&#8217; Cymru<\/strong> yn cael eu cynnwys, fel y Deml Heddwch, Ap\u00eal Heddwch Menywod 1923, a dyddiadau ar gyfer WCIA a Sefydliadau Dinesig Sifil eraill Cymru<\/li>\n<\/div>\n\n<div class=\"container\">\n<li>Nodir <strong>tymhorau ysgolion a gwyliau cyhoeddus<\/strong> er mwyn cyfeirio atynt, gyda dolenni i ganllawiau&#8217;r Llywodraeth, ynghyd \u00e2 <a href=\"https:\/\/www.timeanddate.com\/holidays\/uk\/\">gwyliau crefyddol pwysig<\/a> ar draws prif grwpiau ffydd y DU.<\/li>\n<\/div>\n\n<div class=\"container\">\n<li>Mae&#8217;r rhan fwyaf o <strong>ddyddiadau&#8217;n digwydd bob blwyddyn<\/strong> (gyda rhywfaint o amrywiaeth ar gyfer digwyddiadau a gwyliau cyhoeddus). Mae&#8217;r rhestr hon yn gywir ar gyfer 2023-24, gall digwyddiadau unigol ar gyfer y blynyddoedd i ddod symud ychydig ddyddiau y naill ffordd neu&#8217;r llall.<\/li>\n<\/div>\n\n<div class=\"container\">\n<li>Rydym yn gobeithio cylchdroi&#8217;r rhestr bob tri mis fel bod y &#8216;chwarter&#8217; presennol yn ymddangos ar y top, a diweddaru unrhyw newidiadau.<\/li>\n<\/div><\/ul>\n<\/div>\n\n<div class=\"container\">\n<p>Os fyddwch chi\u2019n yn sylwi ar unrhyw ddyddiadau (neu adnoddau\/dolenni defnyddiol) a fyddai&#8217;n ddefnyddiol i&#8217;w hychwanegu, e-bostiwch <a href=\"mailto:walesforpeace@wcia.org.uk\">walesforpeace@wcia.org.uk.<\/a><\/p>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading has-text-align-center\">Chwarter yr HYDREF <\/h2>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading\">Hydref<\/h2>\n<\/div>\n\n<div class=\"container\">\n<p>1-31 Hyd \u2013 <a href=\"https:\/\/www.blackhistorymonth.org.uk\/\">Mis Hanes Pobl Dduon<\/a> ar draws y DU<br>5 Hydref \u2013 Diwrnod Athrawon y Byd [UNESCO] (<a href=\"https:\/\/unesdoc.unesco.org\/ark:\/48223\/pf0000095720.page=5\">(27 C\/INF.7)<\/a>)<br>11 Hydref &#8211; <a href=\"https:\/\/www.un.org\/en\/observances\/girl-child-day\">Diwrnod Rhyngwladol yr Eneth (A\/RES\/66\/170)<\/a><br>11 Hyd <strong>\u2013 WCIA50<\/strong>, <a href=\"https:\/\/cymru.global\/cy\/wcia50\/\"><strong>Pen-blwydd agor WCIA<\/strong><\/a>, Canolfan Materion Rhyngwladol Cymru ar 11 Hyd 1973<br>17 Hyd \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/day-for-eradicating-poverty\">Diwrnod Rhyngwladol ar gyfer Dileu Tlodi (A \/ RES \/ 47\/196)<\/a><br>24 Hyd \u2013 <a href=\"https:\/\/documents-dds-ny.un.org\/doc\/RESOLUTION\/GEN\/NR0\/038\/75\/PDF\/NR003875.pdf?OpenElement\">Diwrnod y <strong>Cenhedloedd Unedig<\/strong> (A\/RES\/168 (II))<\/a> \u2013 rhestr o <a href=\"https:\/\/www.un.org\/en\/observances\/un-anniversaries\">benblwyddi&#8217;r Cenhedloedd Unedig<\/a><br>27 Hyd \u2013 Pen-blwydd Cynhadledd 1af <a href=\"https:\/\/cymru.global\/cy\/wcia-news-cy\/wcia-history-cy\/cymru-yn-unor-cenhedloedd-adeiladu-byd-gwell-ar-ol-yr-ail-ryfel-byd\/\">Cymdeithas y Cenhedloedd Unedig yng Nghymru<\/a>, olynydd Undeb Cynghrair y Cenhedloedd Cymru ar \u00f4l yr Ail Ryfel Byd, 27 Hydref 1945.<br>30 Hyd-3 Tach \u2013 <a href=\"https:\/\/www.llyw.cymru\/tymhorau-gwyliau-a-dyddiau-cau-ysgolion\">Gwyliau Hanner Tymor<\/a> Ysgolion Cymru<br>31 Hyd \u2013 <a href=\"https:\/\/www.timeanddate.com\/holidays\/uk\/halloween\">Calan Gaeaf<\/a> (yn cael ei ddathlu\u2019n rhyngwladol)<\/p>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading\">Tachwedd<\/h2>\n<\/div>\n\n<div class=\"container\">\n<p>4 Tach \u2013 G\u0175yl Cofio Cymru, Neuadd Dewi Sant, yn dechrau <strong>wythnos o weithgareddau Cofio<\/strong> ar draws y DU<br>5 Tach \u2013 <a href=\"https:\/\/www.timeanddate.com\/holidays\/uk\/guy-fawkes-day\">Diwrnod Guto Ffowc<\/a>, DU<br>11 Tach \u2013 Diwrnod y Cofio am 11.00 ar 11\/11\/11 (cydgysylltiad y DU gan y <a href=\"https:\/\/www.britishlegion.org.uk\/get-involved\/remembrance\/what-were-remembering-this-year\">Lleng Brydeinig);<\/a><br>12 Tach \u2013 <a href=\"https:\/\/www.britishlegion.org.uk\/get-involved\/remembrance\/remembrance-events\/remembrance-sunday\">Sul y Cofio<\/a><br>12 Tach \u2013 <a href=\"https:\/\/www.timeanddate.com\/holidays\/uk\/diwali\">Diwali<\/a> (Hind\u0175, Sikh a Jain)<br>17 Tach \u2013 <a href=\"https:\/\/www.bbcchildreninneed.co.uk\/\">BBC &#8211; Plant Mewn Angen<\/a> i godi arian ar draws y DU<br>20 Tach \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/world-childrens-day\">Diwrnod Plant y Byd (A\/RES\/836(IX))<\/a><br>20 Tachwedd \u2013 Pen-blwydd <a href=\"https:\/\/unesdoc.unesco.org\/ark:\/48223\/pf0000114580\">Cynhadledd UNESCO 1af<\/a> ym Mharis, 20 Tachwedd \u2013 10 Rhagfyr 1946 (cymeradwyo Cyfansoddiad a dibenion a ddrafftiwyd gan Bwyllgor Cymru o dan y Parch Gwilym Davies)<br><strong>23 Tach \u2013 85 mlynedd<\/strong> <strong>ers agor <\/strong><a href=\"https:\/\/cymru.global\/cy\/temlheddwch\/\"><strong>y Deml Heddwch ac Iechyd, 23 Tachwedd 1938<\/strong><\/a><strong>.<\/strong><br>29 Tachwedd &#8211; <a href=\"https:\/\/www.un.org\/en\/observances\/international-day-of-solidarity-with-the-palestinian-people\">Diwrnod Rhyngwladol o Undod gyda&#8217;r Bobl Palesteinaidd (A\/RES\/32\/40B)<\/a><br>30 Tach \u2013 Diwrnod St Andrews (Yr Alban)<\/p>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading\">Rhagfyr<\/h2>\n<\/div>\n\n<div class=\"container\">\n<p>1 Rhagfyr \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/world-aids-day\">Diwrnod AIDS y Byd<\/a><br>2 Rhagfyr &#8211; <a href=\"https:\/\/www.un.org\/en\/observances\/slavery-abolition-day\">Diwrnod Rhyngwladol Diddymu Caethwasiaeth (A\/RES\/317(IV))<\/a><br>3 Rhagfyr &#8211; <a href=\"https:\/\/www.un.org\/en\/observances\/day-of-persons-with-disabilities\">Diwrnod Rhyngwladol Pobl ag Anableddau (A\/RES\/47\/3)<\/a><br>10 Rhag \u2013 Ap\u00eal Heddwch Eglwysi Cymru i America \u2013 <a href=\"https:\/\/cymru.global\/our-work\/peace-heritage\/1925-churches-peace_appeal\/\">pen-blwydd cyflwyno yn Detroit<\/a>, ar 10 Rhagfyr 1925, i Gyngres Cyngor Ffederal Eglwysi Crist yn America, gan y Parch Gwilym Davies.<br>8-15 Rhag \u2013 <a href=\"https:\/\/www.timeanddate.com\/holidays\/uk\/chanukah\">Hannukkah<\/a> (Iddewig)<br>10 Rhagfyr &#8211; <a href=\"https:\/\/daccess-ods.un.org\/tmp\/9915305.37605286.html\"><strong>Diwrnod Hawliau Dynol<\/strong> (A\/RES\/423 (V))<\/a> ac UN75 <a href=\"https:\/\/www.ohchr.org\/en\/get-involved\/campaign\/udhr-75\">Dathlu 75 mlynedd y Datganiad Cyffredinol o Hawliau Dynol<\/a><br>18 Rhag \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/migrants-day\">Diwrnod Rhyngwladol yr Ymfudwyr (A \/ RES \/ 55\/93)<\/a><br>20 Rhagfyr \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/migrants-day\">Diwrnod Rhyngwladol Cydsefyll Dynol (A\/RES\/60\/209)<\/a><br>23 Rhagfyr &#8211; 7 Ionawr \u2013 <a href=\"https:\/\/www.llyw.cymru\/tymhorau-gwyliau-a-dyddiau-cau-ysgolion\">Gwyliau Nadolig<\/a> Ysgolion Cymru<br>25-26 Rhag \u2013 <a href=\"https:\/\/www.gov.uk\/bank-holidays\">Gwyliau Banc<\/a> Dydd Nadolig a San Steffan<\/p>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading has-text-align-center\">Chwarter y Gaeaf <\/h2>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading\">Ionawr<\/h2>\n<\/div>\n\n<div class=\"container\">\n<p>1 Ionawr \u2013 <a href=\"https:\/\/www.gov.uk\/bank-holidays\">G\u0175yl y Banc<\/a> Dydd Calan, Addunedau&#8217;r Flwyddyn Newydd ar gyfer byd gwell!<br>8 Ion \u2013 Dechrau <a href=\"https:\/\/www.llyw.cymru\/tymhorau-gwyliau-a-dyddiau-cau-ysgolion\">Tymor y Gwanwyn Ysgolion<\/a> (hyd at 22 Mawrth)<br>10 Ion \u2013 Pen-blwydd cyfarfod sefydlwyr Undeb Cynghrair y Cenhedloedd Cymru yn Llandinam, Powys, 1922<br>10 Ion &#8211; Pen-blwydd <a href=\"https:\/\/cymru.global\/cy\/wcia-news-cy\/wcia-history-cy\/cymru-yn-unor-cenhedloedd-adeiladu-byd-gwell-ar-ol-yr-ail-ryfel-byd\/\">Cynulliad Cyffredinol 1af y Cenhedloedd Unedig<\/a> yn Llundain, 10 Ionawr-14 Chwefror 1946, gyda llawer o gyfranogiad y Deml Heddwch (trefnwyr, ysgrifenyddion, siaradwyr a ch\u00f4r)<br>24 Ion \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/education-day\"><strong>Diwrnod Rhyngwladol Addysg<\/strong> (A\/RES\/73\/25)<\/a><br>27 Ion \u2013 <a href=\"https:\/\/www.hmd.org.uk\/\"><strong>Diwrnod Cofio&#8217;r Holocost<\/strong><\/a> yn y DU; Cenhedloedd Unedig &#8211; <a href=\"https:\/\/www.un.org\/en\/holocaustremembrance\/observance\/\">Diwrnod Rhyngwladol Coff\u00e1u Dioddefwyr yr Holocost (A\/RES\/60\/7)<\/a><\/p>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading\">Chwefror<\/h2>\n<\/div>\n\n<div class=\"container\">\n<p>01 Chwe &#8211; Wythnos <a href=\"https:\/\/www.un.org\/en\/observances\/interfaith-harmony-week\">Cytgord Rhyng-ffydd y Byd<\/a>,1-7 Chwefror (A\/RES\/65\/5)<br>02 Chwe &#8211; Ap\u00eal <a href=\"https:\/\/cymru.global\/academiheddwch\/womens-centenary-timeline\/\">Heddwch dros Merched<\/a>, 2 Chwe 1924, Ymadawodd Annie H-G a\u2019i dirprwyaeth o Euston \/ Porthladd Lerpwl ar y Daith Heddwch yn America.<br>06 Chwe &#8211; Ymwybyddiaeth o Anffurfio <a href=\"https:\/\/www.un.org\/en\/observances\/female-genital-mutilation-day\">Organau Cenhedlu Benywod<\/a>: Diwrnod Rhyngwladol Dim Goddefgarwch i Anffurfio Organau Cenhedlu Benywod \u00a0(A\/RES\/67\/146)<br>06 Chwe &#8211; pen-blwydd <a href=\"https:\/\/cymru.global\/our-work\/peace-heritage\/1932-world-disarmament-memorial\/\">Cofeb Cynhadledd Diarfogi&#8217;r Byd<\/a> 1932 o Gymru yn cael ei chyflwyno i Arlywydd WDC, yr Arthur Henderson yng Ngenefa.<br>10 Chwe &#8211; <a href=\"https:\/\/thewoksoflife.com\/when-is-chinese-new-year-2024\/\">Blwyddyn Newydd Tsieineaidd y Ddraig<\/a> (2024, newidiadau yn flynyddol gyda chylchoedd lleuad; 29 Ion 2025; 17 Chwef 2026; 6 Chwef 2027). Dechrau gwyliau cenedlaethol wythnos 1 yn Tsieina, ac ar gyfer llawer o ddiaspora Tsieineaidd.<br>11 Chwe &#8211; Cyrhaeddodd dirprwyaeth <a href=\"https:\/\/cymru.global\/academiheddwch\/womens-centenary-timeline\/\">Ap\u00eal Heddwch Menywod<\/a> Efrog Newydd 11 Chwe 1924<br>12-16 Chwe &#8211;<a href=\"https:\/\/www.gov.wales\/school-terms-holidays-and-closures\">Hanner Tymor y Gwanwyn<\/a> i Ysgolion<br>19 Chwe &#8211; <a href=\"https:\/\/cymru.global\/academiheddwch\/womens-centenary-timeline\/\">Deiseb Heddwch y Menywod<\/a> a chist yn cael eu cyflwyno i Fenywod America yng Ngwesty Biltmore, Efrog Newydd 19 Chwe 1924<br>20 Chwe &#8211; <strong>Diwrnod <a href=\"https:\/\/www.un.org\/en\/observances\/social-justice-day\">Cyfiawnder Cymdeithasol<\/a> y Byd<\/strong> (A\/RES\/62\/10)<br>21 Chwe &#8211; Diwrnod <a href=\"https:\/\/www.un.org\/en\/observances\/mother-language-day\">Mamiaith Rhyngwladol <\/a>(A\/RES\/56\/262) &#8211; dathlu&#8217;r Gymraeg ochr yn ochr ag ieithoedd byw ar draws y byd<br>21 Chwe &#8211; Cofeb <a href=\"https:\/\/cymru.global\/academiheddwch\/womens-centenary-timeline\/\">Ap\u00eal Heddwch y Merched<\/a> yn cael ei chyflwyno i Arlywydd yr Unol Daleithiau Calvin Coolidge yn y T\u0177 Gwyn, Washington 21 Chwef 1924<br>24 Chwe &#8211; <a href=\"https:\/\/cymru.global\/academiheddwch\/womens-centenary-timeline\/\">Taith Heddwch Menywod<\/a> yr Unol Daleithiau yn cychwyn o Washington tuag at Chicago (dychwelyd i Efrog Newydd ar 19 Mawrth 1924)<\/p>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading\">Mawrth<\/h2>\n<\/div>\n\n<div class=\"container\">\n<p>01 Maw \u2013 <a href=\"https:\/\/www.awarenessdays.com\/awareness-days-calendar\/st-davids-day-2024\/\"><strong>Dydd G\u0175yl Dewi<\/strong><\/a>, diwrnod cenedlaethol Cymru<br>05 Mawrth \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/disarmament-non-proliferation-awareness-day\">Diwrnod Rhyngwladol Ymwybyddiaeth Diarfogi ac Atal Twf Arfogaeth<\/a> (A\/RES\/77\/51)<br>08 Mawrth \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/womens-day\"><strong>Diwrnod Rhyngwladol y Menywod<\/strong><\/a><strong>;<\/strong> IWD2024 yn Lloegr;<br>10 Mawrth \u2013 Sul y Mamau<br>11 Maw-8 Ebr \u2013 <a href=\"https:\/\/www.timeanddate.com\/holidays\/uk\/ramadan-begins\">Ramadan<\/a> (Islam)<br>12 Mawrth \u2013 Pen-blwydd <a href=\"https:\/\/cymru.global\/our-work\/peace-heritage\/heritage-of-dolen-cymru\/\">sefydlu Dolen Cymru<\/a>, Cyswllt Lesotho Cymru, 12 Mawrth 1985<br>17 Mawrth \u2013 Dydd Sant Padrig (Iwerddon)<br>19 Mawrth &#8211; 1924 <a href=\"https:\/\/cymru.global\/cy\/academiheddwch\/womens-centenary-timeline\/\">Taith Heddwch Menywod<\/a> yr Unol Daleithiau yn dychwelyd i Ddinas Efrog Newydd yn barod ar gyfer y fordaith adref i Gymru<br>20 Mawrth \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/happiness-day\">Diwrnod Rhyngwladol Hapusrwydd<\/a> (A\/RES\/66\/281)<br>21 Mawrth \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/end-racism-day\">Diwrnod Rhyngwladol ar gyfer Dileu Gwahaniaethu ar sail Hil<\/a> (A\/RES\/2142 (XXI)<br>21 Mawrth \u2013 <a href=\"https:\/\/en.unesco.org\/commemorations\/worldpoetryday\">Diwrnod Barddoniaeth y Byd<\/a> [UNESCO]<br>21 Mawrth \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/forests-and-trees-day\">Diwrnod Rhyngwladol y Coedwigoedd<\/a> (A\/RES\/67\/200)<br>22 Mawrth \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/water-day\">Diwrnod D\u0175r y Byd<\/a> (A\/RES\/47\/193)<br>23 Maw-7 Ebrill \u2013 <a href=\"https:\/\/www.llyw.cymru\/tymhorau-gwyliau-a-dyddiau-cau-ysgolion\">Gwyliau Pasg Ysgolion<\/a> \/ diwedd Tymor y Gwanwyn<br>24 Mawrth \u2013 <a href=\"https:\/\/www.who.int\/campaigns\/world-tb-day\/\">Diwrnod Twbercwlosis y Byd<\/a> [WHO]<br>25 Mawrth \u2013 <a href=\"https:\/\/www.un.org\/en\/rememberslavery\/observance\">Diwrnod Rhyngwladol Cofio Dioddefwyr Caethwasiaeth a&#8217;r Fasnach Gaethwasiaeth Trawsatlantig<\/a> (A\/RES\/62\/122)<br>29 Maw-1 Ebr \u2013 <a href=\"https:\/\/www.gov.uk\/bank-holidays\">Gwyliau Banc<\/a> y Pasg (Dydd Gwener y Groglith\/Dydd Llun Pasg)<\/p>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading has-text-align-center\">Chwarter y GWANWYN<\/h2>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading\">Ebrill<\/h2>\n<\/div>\n\n<div class=\"container\">\n<p>1 Ebrill &#8211; Diwrnod Ff\u0175l Ebrill (tan 12.00!)<br>7 Ebrill &#8211; Diwrnod <a href=\"https:\/\/www.who.int\/campaigns\/world-health-day\">Iechyd y Byd<\/a> (WHA\/A.2\/Res.35)<br>8 Ebrill &#8211; Seremoni <a href=\"https:\/\/cymru.global\/templetours\/portico\/\">Carreg Sylfaen<\/a> y Deml Heddwch, a osodwyd ar 8 Ebrill 1937 gan yr Arglwydd Halifax (<a href=\"https:\/\/www.casgliadywerin.cymru\/collections\/888306\">Casgliad PCW<\/a> erthygl nodwedd.<br>8 Ebrill &#8211; Dechrau <a href=\"https:\/\/www.llyw.cymru\/tymhorau-gwyliau-a-dyddiau-cau-ysgolion\">Tymor yr Haf i Ysgolion<\/a> (hyd at 22 Gorffennaf)<br>9 Ebrill &#8211; <a href=\"https:\/\/www.timeanddate.com\/holidays\/uk\/eid-al-fitr\">Eid al-Fitr<\/a> \/ diwedd Ramadan (Islam)<br>22-30 Ebrill &#8211; <a href=\"https:\/\/www.chabad.org\/holidays\/passover\/default_cdo\/jewish\/Passover-2024-Pesach.htm\">G\u0175yl y Bara Croyw<\/a> (Iddewig)<br>23 Ebrill &#8211; Dydd San Si\u00f4r (Lloegr)<br>23 Ebrill &#8211; Diwrnod y <a href=\"https:\/\/www.chabad.org\/holidays\/passover\/default_cdo\/jewish\/Passover-2024-Pesach.htm\">Llyfr<\/a> [<a href=\"https:\/\/unesdoc.unesco.org\/ark:\/48223\/pf0000101803.page=56\">UNESCO<\/a>)<br>24 Ebrill &#8211; Diwrnod Rhyngwladol <a href=\"https:\/\/www.un.org\/en\/observances\/Multilateralism-for-Peace-day\">Amlochrogiaeth a Diplomyddiaeth<\/a> dros Heddwch  (<a href=\"http:\/\/undocs.org\/en\/A\/RES\/73\/127\">A\/RES\/73\/127<\/a>) <\/p>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading\">Mai<\/h2>\n<\/div>\n\n<div class=\"container\">\n<p>6 Mai \u2013 <a href=\"https:\/\/www.gov.uk\/bank-holidays\">G\u0175yl Banc<\/a> Calan Mai<br>8 Mai \u2013 <a href=\"https:\/\/en.wikipedia.org\/wiki\/Victory_in_Europe_Day\">Diwrnod VE<\/a>, pen-blwydd <a href=\"https:\/\/en.wikipedia.org\/wiki\/End_of_World_War_II_in_Europe\">diwedd yr Ail Ryfel Byd<\/a> yn Ewrop (Diwrnod &#8216;Buddugoliaeth yn Ewrop&#8217;), 8 Mai 1945<br>15 Mai \u2013 <a href=\"https:\/\/www.ppu.org.uk\/international-conscientious-objectors-day-may-15th\">Diwrnod Rhyngwladol Gwrthwynebwyr Cydwybodol, DU<\/a><br>16 Mai \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/living-in-peace-day\">Diwrnod Rhyngwladol Byw Gyda&#8217;n Gilydd mewn Heddwch<\/a> (<a href=\"http:\/\/undocs.org\/en\/A\/RES\/72\/130\">A\/RES\/72\/130<\/a>)<br>18 Mai \u2013 <a href=\"https:\/\/en.wikipedia.org\/wiki\/Urdd_Peace_and_Goodwill_Message\">Diwrnod Heddwch ac Ewyllys Da<\/a> \u2013 dyddiad darlledu traddodiadol ar gyfer <a href=\"https:\/\/www.urdd.cymru\/cy\/neges-heddwch-eleni\/\">Neges Heddwch ac Ewyllys Da Ieuenctid<\/a> Cymru o 1923 hyd heddiw.<br>20 Mai \u2013 <a href=\"https:\/\/www.timeanddate.com\/holidays\/uk\/whit-monday\">Dydd Llun Sulgwyn<\/a> (Sulgwyn yn draddodiadol oedd y &#8216;cynulliad heddwch&#8217; blynyddol ar gyfer Undeb Cynghrair y Cenhedloedd Cymru trwy&#8217;r 1920au-30au)<br>23 Mai \u2013 Pen-blwydd <a href=\"https:\/\/cymru.global\/cy\/wcia-news-cy\/wcia-history-cy\/ysbrydolwyd-gan-annie-hanes-deiseb-merched-dros-heddwch-i-america-1924\/\">Cynhadledd Menywod Cymru yn Aberystwyth<\/a>, 23 Mai 1923, a gychwynnodd Ap\u00eal Heddwch y Menywod i America.<br>23 Mai-2 Mehefin \u2013 <a href=\"https:\/\/www.hayfestival.com\/cymraeg\"><strong>G\u0175yl Lenyddiaeth y Gelli<\/strong><\/a>, Y Gelli Gandryll, Powys<br>27 Mai \u2013 <a href=\"https:\/\/www.gov.uk\/bank-holidays\">G\u0175yl y Banc<\/a> y Gwanwyn<br>27-31 Mai \u2013 <a href=\"https:\/\/www.llyw.cymru\/tymhorau-gwyliau-a-dyddiau-cau-ysgolion\">Egwyl Hanner Tymor yr Haf i Ysgolion<\/a><br>27 Mai-1 Mehefin \u2013 <a href=\"https:\/\/www.urdd.cymru\/cy\/eisteddfod\/2024\/\"><strong>Eisteddfod yr Urdd 2024, Maldwyn<\/strong><\/a> (Meifod ger y Trallwng) \u2013 <a href=\"https:\/\/www.npt.gov.uk\/1410?pr_id=7210&amp;lang=cy-gb\">2025 Urdd @ Margam<\/a>, Port Talbot 26-31 Mai 2025<\/p>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading\">Mehefin<\/h2>\n<\/div>\n\n<div class=\"container\">\n<p>5 Mehefin \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/environment-day\">Diwrnod<strong> Amgylchedd <\/strong>y Byd<\/a><strong> <\/strong>(<a href=\"http:\/\/undocs.org\/en\/A\/RES\/2994%20(XXVII)\">A\/RES\/2994 (XXVII)<\/a>)<strong><br><\/strong>15 Mehefin \u2013<a href=\"https:\/\/www.timeanddate.com\/holidays\/uk\/kings-birthday\">Pen-blwydd y Brenin<\/a> (Y Gymanwlad|)<strong><br><\/strong>16 Mehefin \u2013 Pen-blwydd marwolaeth yr <a href=\"https:\/\/cymru.global\/cy\/wcia-news-cy\/wcia-history-cy\/david-davies-75-tad-rhyngwladol-y-deml-heddwch\/\">Arglwydd David Davies<\/a>, 16 Mehefin 1944<strong><br><\/strong>17 Mehefin \u2013 <a href=\"https:\/\/www.timeanddate.com\/holidays\/uk\/eid-al-adha\">Eid al-Adha<\/a> (Islam)<strong><br><\/strong>20 Mehefin \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/refugee-day\">Diwrnod Ffoaduriaid y Byd<\/a> (<a href=\"http:\/\/undocs.org\/en\/A\/RES\/55\/76\">A\/RES\/55\/76<\/a>) ac <a href=\"https:\/\/wrc.wales\/events\/refugee-week-2023\/\"><strong>Wythnos y Ffoaduriaid yng Nghymru<\/strong><\/a> 19-24 Mehefin (cydlynir gan <a href=\"https:\/\/wrc.wales\/cy\/hafan\/\">Gyngor Ffoaduriaid Cymru<\/a>)<strong><br><\/strong>22 Mehefin \u2013 <a href=\"https:\/\/www.timeanddate.com\/holidays\/uk\/windrush-day\">Diwrnod Windrush<\/a><strong><br><\/strong>24 Mehefin \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/women-in-diplomacy-day\">Diwrnod Rhyngwladol Menywod mewn Diplomyddiaeth<\/a> (<a href=\"https:\/\/undocs.org\/en\/A\/RES\/76\/269\">A\/RES\/76\/269<\/a>)<strong><br><\/strong>25 Mehefin \u2013 3 Gorffennaf \u2013 Pen-blwydd <a href=\"https:\/\/cymru.global\/our-work\/peace-heritage\/1926-aberystwyth-peace-congress\/\">Cyngres Heddwch y Byd 1926 yn Aberystwyth<\/a>, Ffederasiwn Rhyngwladol Cymdeithasau Cynghrair y Cenhedloedd (IFLNS)<br>30 Mehefin \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/parliamentarism-day\">Diwrnod Rhyngwladol Seneddwyr<\/a> (<a href=\"https:\/\/undocs.org\/en\/A\/RES\/72\/278\">A\/RES\/72\/278<\/a>)<\/p>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading has-text-align-center\">Chwarter yr Haf <\/h2>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading\">Gorffennaf<\/h2>\n<\/div>\n\n<div class=\"container\">\n<p>2-7 Gorffennaf &#8211; <a href=\"https:\/\/international-eisteddfod.co.uk\/cy\/\">Eisteddfod Ryngwladol Llangollen<\/a>, Sir Ddinbych<br>5 Gorffennaf \u2013 <a href=\"https:\/\/www.england.nhs.uk\/nhsbirthday\/about-the-nhs-birthday\/\">Pen-blwydd &#8216;Diwrnod Penodedig&#8217; y GIG<\/a> ar 5 Gorffennaf 1948, pan lansiwyd Gwasanaeth Iechyd Gwladol y DU (gweler y <a href=\"https:\/\/cymru.global\/cy\/events\/temple85-nhs75\/\">digwyddiad NHS75<\/a>)<br>11 Gorffennaf \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/world-population-day\">Diwrnod Poblogaeth y Byd<\/a> (<a href=\"https:\/\/undocs.org\/en\/A\/RES\/45\/216\">A\/RES\/45\/216<\/a>)<br>15 Gorffennaf \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/world-youth-skills-day\">Diwrnod Sgiliau Ieuenctid y Byd<\/a> (<a href=\"https:\/\/undocs.org\/en\/A\/RES\/69\/145\">A\/RES\/69\/145<\/a>)<br>18 Gorffennaf &#8211; <a href=\"https:\/\/www.un.org\/en\/events\/mandeladay\/\">Diwrnod Rhyngwladol Nelson Mandela<\/a> (<a href=\"https:\/\/undocs.org\/en\/A\/RES\/64\/13\">A\/RES\/64\/13<\/a>)<br>22 Gorffennaf \u2013 Dechrau <a href=\"https:\/\/www.llyw.cymru\/tymhorau-gwyliau-a-dyddiau-cau-ysgolion\">Gwyliau Haf Ysgolion Cymru<\/a> (hyd at 2 Medi 2024 \u2013<a href=\"https:\/\/www.llyw.cymru\/dyddiadau-tymor-ysgol-2024-i-2025-wediu-cymeradwyo\">dyddiadau blwyddyn ysgol 2024-25)<\/a><br>22-25 Gorffennaf \u2013 <a href=\"https:\/\/cafc.cymru\/sioe-frenhinol-cymru\/\"><strong>Sioe Frenhinol Cymru<\/strong>, Llanfair-ym-Muallt<\/a><br>30 Gorffennaf \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/friendship-day\">Diwrnod Rhyngwladol Cyfeillgarwch<\/a> (<a href=\"https:\/\/undocs.org\/en\/A\/RES\/65\/275\">A\/RES\/65\/275<\/a>)<\/p>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading\">Awst<\/h2>\n<\/div>\n\n<div class=\"container\">\n<p>3-10 Awst &#8211; <strong><a href=\"https:\/\/eisteddfod.wales\/2024\">Eisteddfod Genedlaethol 2024 ym Mhontypridd<\/a><\/strong>, RhCT (<a href=\"https:\/\/eisteddfod.wales\/node\/69\">Eisteddfod 2025 yn Wrecsam<\/a>)<br>4 Awst &#8211; Pen-blwydd \u2019<a href=\"https:\/\/en.wikipedia.org\/wiki\/British_entry_into_World_War_I\">Dechrau&#8217;r Rhyfel Byd Cyntaf<\/a>\u2019 4 Awst 1914<br>6 Awst &#8211; <a href=\"https:\/\/cnduk.org\/resources\/hiroshima-and-nagasaki\/\">Diwrnod Hiroshima<\/a> yn erbyn Arfau Niwclear, digwyddiadau yn y DU a gydlynir gan <a href=\"https:\/\/cnduk.org\/\">CND<\/a> <\/p>\n<\/div>\n\n<div class=\"container\">\n<p>9 Awst &#8211; Diwrnod Rhyngwladol <a href=\"https:\/\/www.un.org\/en\/observances\/indigenous-day\">Pobl Frodorol y Byd<\/a> (A\/RES\/49\/214)<br>12 Awst &#8211; Diwrnod <a href=\"https:\/\/www.un.org\/en\/observances\/youth-day\">Ieuenctid Rhyngwladol<\/a> (A\/RES\/54\/120<br>19 Awst &#8211; Diwrnod <a href=\"https:\/\/www.un.org\/en\/observances\/humanitarian-day\">Dyngarol y Byd<\/a> (A\/RES\/63\/139<br>23 Awst &#8211; \u2019Diwrnod Rhyngwladol <a href=\"https:\/\/en.unesco.org\/commemorations\/remembranceday\">Coff\u00e1u\u2019r Fasnach Gaethweision a&#8217;i Diddymu<\/a> [UNESCO]<br>26 Awst &#8211; G\u0175yl y <a href=\"https:\/\/www.gov.uk\/bank-holidays\">Banc yr Haf<\/a><\/p>\n<\/div>\n\n<div class=\"container\">\n<p><\/p>\n<\/div>\n\n<div class=\"container\">\n<h2 class=\"wp-block-heading\">Medi<\/h2>\n<\/div>\n\n<div class=\"container\">\n<p>2 Medi \u2013 Dechrau <a href=\"https:\/\/www.llyw.cymru\/tymhorau-gwyliau-a-dyddiau-cau-ysgolion\">Tymor yr Hydref i Ysgolion<\/a> <a href=\"https:\/\/www.gov.wales\/sites\/default\/files\/publications\/2022-12\/approved-school-term-dates-2024-to-2025.pdf\">(dyddiadau tymor 2024-25 yma)<\/a><br>2 Medi \u2013 Pen-blwydd <a href=\"https:\/\/en.wikipedia.org\/wiki\/End_of_World_War_II_in_Europe\">diwedd yr Ail Ryfel Byd<\/a> (yn y M\u00f4r Tawel), 2 Medi 1945<br>3 Medi \u2013 Pen-blwydd <a href=\"https:\/\/en.wikipedia.org\/wiki\/British_Empire_in_World_War_II\">Dechrau\u2019r Ail Ryfel Byd<\/a>, 3 Medi 1939<br>5 Medi \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/charity-day\">Diwrnod Rhyngwladol yr Elusen<\/a> (<a href=\"https:\/\/undocs.org\/en\/A\/RES\/67\/105\">A\/RES\/67\/105<\/a>)<br>8 Medi \u2013 <a href=\"https:\/\/www.unesco.org\/en\/days\/literacy\">Diwrnod Llythrennedd Rhyngwladol [UNESCO]<\/a> (<a href=\"https:\/\/unesdoc.unesco.org\/ark:\/48223\/pf0000114048.xml=http:\/www.unesco.org\/ulis\/cgi-bin\/ulis.pl\">UNESCO 14 C\/Penderfyniad 1.441<\/a>)<br>15 Medi \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/democracy-day\">Diwrnod Rhyngwladol Democratiaeth<\/a> (<a href=\"https:\/\/undocs.org\/en\/A\/RES\/62\/7\">A\/RES\/62\/7<\/a>)<br>15-17 Medi 2023 \/ 2-4 Hyd 2024 \u2013 <a href=\"https:\/\/www.chabad.org\/library\/article_cdo\/aid\/4644\/jewish\/Rosh-Hashanah.htm\">Rosh Hashanah<\/a>, Blwyddyn Newydd Iddewig<br>21 Medi \u2013 <a href=\"https:\/\/www.un.org\/en\/observances\/international-day-peace\">Diwrnod Rhyngwladol <strong>Heddwch<\/strong><\/a><strong> <\/strong>(<a href=\"https:\/\/undocs.org\/en\/A\/RES\/36\/67\">A\/RES\/36\/67<\/a>)<\/p>\n<\/div>\n\n<div class=\"container\">\n<p> <\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Mae&#8217;r dudalen hon yn dwyn ynghyd adnodd &#8216;cyfeirio hawdd&#8217; ar gyfer ymgyrchwyr, athrawon, blogwyr a grwpiau cymunedol ar draws Cymru sy&#8217;n ceisio cysylltu eu gweithgareddau \u00e2 digwyddiadau ehangach yng Nghymru a&#8217;r byd. Os fyddwch chi\u2019n yn sylwi ar unrhyw ddyddiadau (neu adnoddau\/dolenni defnyddiol) a fyddai&#8217;n ddefnyddiol i&#8217;w hychwanegu, e-bostiwch walesforpeace@wcia.org.uk. [&#8230;]<\/p>\n","protected":false},"author":7,"featured_media":37544,"parent":5181,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"iawp_total_views":76,"footnotes":""},"class_list":["post-37720","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Diwrnod y Cenhedloedd Unedig \/ Rhyngwladol a dyddiadau pwysig i Dreftadaeth Heddwch Cymru ac Actifiaeth Fyd-eang - Cymru Global<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"cy_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Diwrnod y Cenhedloedd Unedig \/ Rhyngwladol a dyddiadau pwysig i Dreftadaeth Heddwch Cymru ac Actifiaeth Fyd-eang - Cymru Global\" \/>\n<meta property=\"og:description\" content=\"Mae&#8217;r dudalen hon yn dwyn ynghyd adnodd &#8216;cyfeirio hawdd&#8217; ar gyfer ymgyrchwyr, athrawon, blogwyr a grwpiau cymunedol ar draws Cymru sy&#8217;n ceisio cysylltu eu gweithgareddau \u00e2 digwyddiadau ehangach yng Nghymru a&#8217;r byd. 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