Jean-Guy Dagenais (born February 2, 1950) is a Canadian politician from Quebec. He was appointed to the Senate of Canada on January 17, 2012, by Stephen Harper after losing in the 2011 Canadian federal election running as a Conservative candidate in Saint-Hyacinthe—Bagot. He represents the Senate division of Victoria (Quebec). In 2019, he left the Conservative Senate caucus to sit with the Canadian Senators Group, and left the Conservative party in 2022 shortly after Pierre Poilievre was elected as leader.