Cynhaliwyd Etholiadau Senedd Ewrop, 2009 yn yr 27 gwladwraeth sy'n aelod o'r Undeb Ewropeaidd rhwng 4 a 7 Mehefin 2009.
Etholwyd cyfanswm o 736 Aelod Senedd Ewrop (ASE) ac 18 gwylwyr ("ASE rhithwir") i gynyrchioli tua 500 miliwn o bobl Ewrop, rhain oedd yr etholiadau rhyngwladol mwyaf erioed.
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