John Millen (born October 18, 1960 in Toronto) is a Canadian sailor.
Millen won the International 14 class World Champion in 1981. He won a bronze medal in the Flying Dutchman Class at the 1988 Summer Olympics with Frank McLaughlin. He also finished 9th in the same category at the 1992 Summer Olympics.
Millen was part of the Canadian team in the 1983 and 1986 America's Cup, sailing first on Canada I and then on Canada II. He was also part of the Canadian team on the Challenger and Defender of the Canada's Cup in 2001 and 2003.
Millen crewed on the Royal Canadian Yacht Club Swan 42 yacht Daring that won the 2011 and 2013 New York Yacht Club Invitational Cups and the 2013 Swan 42 National Championships.