Gérard Onesta (born 5 August 1960) is a French politician and was Member of the European Parliament for the South West of France.

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.

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.