|logo = [[FileDelwedd:Logo y Blaid Lafur (DU) 2.gif|250px|alt=Red on white word "Labour" in sans-serif font to the right of white on red silhouette of a rose.|Logo'r Blaid Lafur]]
|leader = [[Jeremy Corbyn]] [[Aelod Seneddol|AS]]
|leader1_title = Dirprwy Arweinydd
Llinell 38:
}}
[[Plaid wleidyddol]] Brydeinig, [[canol-chwith|ganol-chwith]] yw'r '''Blaid Lafur''' a sefydlwyd ar 27 Chwefror [[1900]]. Gellir ei hystyried yn brif gynrychiolydd y canol-chwith gwleidyddol ym Mhrydain ers y 1920au, pan esblygodd o'r undebau llafur a phleidiau [[sosialaeth|sosialaidd]] y [[19eg ganrif19g]]. Symudodd tua'r canol o dan bolisi "Y Drydedd Ffordd" dan arweinyddiaeth [[Tony Blair]] ac o ganlyniad cyfeirir ati yn y 2000au fel "Llafur Newydd". Mae'r Blaid Lafur yng Nghymru (gweler isod) yn rhan o Blaid Lafur y DU; yr un sefyllfa a'r [[Alban]]. Yn 2015 roedd gan y blaid oddeutu 292,000 o aelodau.<ref name=independent-20150910>{{cite news |url=http://www.independent.co.uk/news/uk/politics/labour-leadership-contest-after-88-days-of-campaigning-how-did-labours-candidates-do-10495726.html |title=Labour leadership contest: After 88 days of campaigning, how did Labour's candidates do? |author=Oliver Wright |newspaper=The Independent |date=10 September 2015 |accessdate=11 September 2015 |quote=the electorate is divided into three groups: 292,000 members, 148,000 union “affiliates” and 112,000 registered supporters who each paid £3 to take part}}</ref><ref name=mirror-20150825>{{cite news |url=http://www.mirror.co.uk/news/uk-news/four-labour-leadership-candidates-rule-6316659 |title=All four Labour leadership candidates rule out legal fight - despite voter count plummeting by 60,000 |author=Dan Bloom |newspaper=Daily Mirror |date=25 August 2015 |accessdate=11 September 2015 |quote=total of those who can vote now stands at 550,816 ... The total still eligible to vote are now 292,505 full paid-up members, 147,134 supporters affiliated through the unions and 110,827 who've paid a £3 fee.}}</ref>
Llinell 51:
==Perfformiad mewn etholiadau==
[[FileDelwedd:Popular vote cy 2.svg|thumbbawd|chwith|900px|Siart yn dangos canrannau'r bleidlais boblogaidd i bleidiau gwledydd Prydain a Gogledd Iwerddon, 1832–2005.]]
