Pierre Brien (born 22 June 1970 in Ville-Marie, Quebec) was a Member of Parliament from 25 October 1993 to 14 March 2003.

He had served as the party's whip from 15 August 2001 until 16 December 2002.

Brien left the Bloc Québécois following his decision to seek a seat in the Quebec National Assembly with the Action démocratique du Québec (ADQ).

He became the ADQ's candidate in the provincial Rouyn-Noranda–Témiscamingue riding, but he and Rémy Trudel of the Parti Québécois both lost against Liberal Daniel Bernard in the 2003 Quebec election.

This article about a Quebec Member of Parliament from Bloc Québécois is a stub.