David Alechenu Bonaventure Mark, GCON (born April 1948) is a retired Nigerian Army Brigadier General and politician. He was President of the Senate of Nigeria from 2007 to 2015 and is the Senator for the Benue State constituency. He is a member of the People's Democratic Party (PDP). Prior to his senatorial career, Mark was the military Governor of Niger State from 1984 to 1986 and the Minister of Communication.