Marc Lemay (born April 4, 1951) is a Canadian politician who served as the Member of Parliament (MP) for Abitibi—Témiscamingue from 2004 to 2011.

A lawyer by occupation, he was first elected to the House of Commons in the 2004 federal election as the Bloc Québécois candidate in the newly-established riding of Abitibi—Témiscamingue.

He defeated sitting MP Gilbert Barrette, the Liberal candidate, by nearly 12,000 votes.

As a parliamentarian, Lemay was the Bloc's critic for Indian Affairs and Northern Development.

He was defeated in the 2011 federal election by Christine Moore of the New Democratic Party (NDP).