John Herron (October 21, 1964) is a politician who was first elected to the House of Commons of Canada in 1997 and was re-elected in 2000. Herron was one of a handful of new PC "Young Turk" MPs (along with Scott Brison, André Bachand and Peter MacKay) who were considered the future youthful leadership material that would restore the ailing Tories to their glory days. Herron was a member of the Progressive Conservative Party until December 2003 and did not support its merger with the Canadian Alliance into the Conservative Party of Canada in 2003. Herron refused to join the new party and, on February 6, 2004, announced that he would sit for the remainder of the Parliamentary session as an Independent Progressive Conservative and would run in the 2004 election as a candidate for the Liberal Party of Canada. One of Herron's last official acts as a sitting MP was his deliverance of the "Progressive Conservative Party Caucus" tribute to retiring politician (former PM and PC Party Leader) Joe Clark in May 2004.
Herron became infamous during the 2003 Progressive Conservative leadership convention when Herron abandoned the campaign of Scott Brison to support Peter MacKay before the second ballot. Brison lost on the second ballot to Jim Prentice by 3 votes and many blamed this loss on Herron and a handful of his riding delegates who followed him to the MacKay camp.