Gregory Jamieson Clark ECA (born March 7, 1971) is a Canadian politician from Alberta. He is the former leader of the Alberta Party, and in the 2015 Alberta general election was elected the party's sole Member of the Legislative Assembly, representing Calgary-Elbow. Clark resigned as leader on November 18, 2017, and served as interim leader until the leadership election when Stephen Mandel was elected the new leader of the party.