| Gérard Onesta | |
| Office: | Member of the Regional council of Occitanie |
| Term Start: | 4 January 2016 |
| President: | Carole Delga |
| Office2: | Member of the European Parliament |
| Term Start2: | 1999 |
| Term End2: | 2009 |
| Birth Date: | 5 August 1960 |
| Birth Place: | Albi, France |
| Party: | Europe Ecology - The Greens |
| Relatives: | Claude Onesta (cousin) |
Gérard Onesta (born 5 August 1960) is a French politician and was Member of the European Parliament for the South West of France.
He is a member of Europe Écologie–The Greens, part of the European Greens. On 20 July 2004 he was re-elected a Member of the European Parliament, and he was elected four times one of its Vice-Presidents. His successor is José Bové.
In March 2010 regional election, he is the leader of Europe Écologie–The Greens in Midi-Pyrénées.
Onesta defines himself as a European federalist, with strong proclivities for regionalism.
His cousin Claude Onesta is the coach of the 5 fold champion France men's national handball team.