Richard Nadeau (born April 5, 1959 in Hawkesbury, Ontario) is a teacher and Bloc Québécois politician in Quebec, Canada.
He taught at the Gisèle Lalonde High School in Orleans, near Ottawa, where he, amongst other things, supervised and acted as speaker for the student debate club.
In the 2000 federal election, Nadeau finished second in Gatineau behind Mark Assad of the Liberal Party of Canada by 13,197 votes.
In the 2004 federal election, he finished second behind Françoise Boivin of the Liberals by 830 votes—a surprisingly close result, given that this had long been reckoned as one of the more federalist regions of Quebec.
Nadeau was heavily defeated by Boivin in the 2011 election by over 27,000 votes as part of the massive NDP surge across Quebec.