Simon-Pierre Diamond (born February 9, 1985) is a politician in Quebec, Canada. He represented the Marguerite-D'Youville district in the National Assembly of Quebec from 2007 to 2008 as a member of the Action démocratique du Québec. From 2004 to 2007, Diamond, a law student at Université de Montréal and a resident of Boucherville, served as President of the Youth Commission of the ADQ. He supports same-sex marriage, but believes that only the federal government has jurisdiction over that issue. Diamond was born in Boucherville, Quebec. His father is a federal Liberal.