Gregory Jamieson Clark 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.

The Alberta Party is a political party in the province of Alberta, Canada. The party describes itself as centrist and pragmatic in that it is not dogmatically ideological in its approach to politics.