By-elections to the 41st Canadian Parliament were held to fill vacancies in the House of Commons of Canada between the 2011 federal election and the 2015 federal election. The 41st Canadian Parliament existed from 2011 to 2015 with the membership of its House of Commons having been determined by the results of the Canadian federal election held on May 2, 2011. The Conservative Party of Canada had a majority government during this Parliament.