Mark Lorne Bonnell (January 4, 1923 – October 9, 2006) was a Canadian physician, provincial politician and senator. Born in Hopefield, Prince Edward Island, the son of Lottie and Harry Bonnell, he received his Doctor of Medicine from Dalhousie University in 1949. He practiced medicine in Murray River. In 1971, he was appointed to the senate representing the senatorial division of Murray River, Prince Edward Island. A Liberal, he retired at the mandatory age of 75 in 1998. His brother John Bonnell succeeded him in a by-election as MLA for 4th Kings.