John Sampson Macfarlane Leech (born 11 April 1971) is a British Liberal Democrat politician who was Member of Parliament for Manchester Withington from 2005 to 2015. Since 2016, he has represented Didsbury West on Manchester City Council. He is best known for Alan Turing's pardon, and the Turing Law which granted a posthumous pardon to more than 49,000 men convicted of gross indecency. He was also the first MP to speak out against the bedroom tax in Parliament.