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.

The New Democratic Party is a federal political party in Canada. Widely described as social democratic, the party occupies the centre-left of the political spectrum, with the party generally sitting to the left of the Liberal Party. The party was founded in 1961 by the Co-operative Commonwealth Federation (CCF) and the Canadian Labour Congress (CLC).