Gérard Deltell MP (born August 8, 1964) is a Canadian politician who has served as the member of Parliament (MP) for Louis-Saint-Laurent since 2015. A member of the Conservative Party, Deltell was Opposition House Leader from 2020 to 2022 under Erin O'Toole and held a number of opposition critic positions. Prior to entering federal politics, he represented Chauveau in the National Assembly of Quebec from 2008 to 2015 and was the leader of the Action démocratique du Québec (ADQ) from 2009 until it merged with the Coalition Avenir Québec (CAQ) in 2012. He served as the CAQ's house leader until 2014.