Jean-Martin Aussant (French: [??~ ma?t?~ ?s?~]) is a Canadian economist, musician, and politician, now serving as Executive director of the Chantier de l'économie sociale.
He represented Nicolet-Yamaska in the National Assembly of Quebec from 2008 to 2012, first as a member of the Parti Québécois and then as leader of his own party, Option nationale.
He was defeated when he ran for re-election in Nicolet-Bécancour in the 2012 general election.
He later rejoined the Parti Québécois to run unsuccessfully in the 2018 Quebec election.