Barrie was a federal electoral district in Ontario, Canada that was represented in the House of Commons of Canada from 2004 to 2015. It consisted of the City of Barrie in the County of Simcoe. It was created in 2003 when its predecessor, Barrie—Simcoe—Bradford, was redistributed. Barrie—Simcoe—Bradford consisted of the City of Barrie and the towns of Bradford West Gwillimbury and Innisfil. It had been formed in 1996 as Barrie—Simcoe from Simcoe Centre and York—Simcoe ridings, but its name was changed before an election was held.

The 2004 Canadian federal election was held on June 28, 2004, to elect members to the House of Commons of Canada of the 38th Parliament of Canada. The Liberal government of Prime Minister Paul Martin lost its majority but was able to continue in office as a minority government after the election. This was the first election contested by the newly amalgamated Conservative Party of Canada, after it was formed by the two right-of-centre parties, the Progressive Conservative Party and the Canadian Alliance.