Steven W. Langdon (born July 15, 1946) is a Canadian academic, politician, economist, and former parliamentarian. Born in Stratford, Ontario, Langdon graduated from the University of Trinity College in the University of Toronto in 1969. He was a candidate for the New Democratic Party on four occasions before being elected to the House of Commons from Essex in the 1984 election. Langdon was re-elected in the 1988 election and stood as a left-wing candidate to succeed Ed Broadbent in the 1989 NDP leadership convention. He finished third. He lost his seat in the 1993 election.