Steven W. Langdon (born July 15, 1946, Stratford, Ontario) is a Canadian academic, politician and former parliamentarian. Langdon was a candidate for the New Democratic Party on four occasions before being elected to the House of Commons from Windsor, Ontario 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 finishing third. He lost his seat in the 1993 election that decimated the NDP.