A by-election was held in the federal riding of Chambly in Quebec, Canada on February 12, 1990, following the resignation of Progressive Conservative Richard Grisé.

Phil Edmonston won a huge victory pushing the PCs into third place becoming the first New Democratic Party (NDP) Member of Parliament in Quebec. He defeated former Quebec cabinet minister Clifford Lincoln by almost 20,000 votes.^[1] However, in the 1993 federal election, Edmonston retired and the seat was taken by the Bloc Québécois and the NDP were reduced to just 3% of the vote.