List of Famous people born in Ontario, Canada

Norman Robert "Bud" Poile was a professional ice hockey player, coach, general manager, and league executive. Bud is the brother of Don Poile, and the father of David Poile.

Nancy Catherine Greene Raine is a former Canadian Senator for British Columbia and an Olympian alpine skier voted as Canada's Female Athlete of the 20th Century. She was born in Ottawa, Ontario, Canada. Greene Raine won a very decisive giant slalom victory in Grenoble, France, in the 1968 Winter Olympics.

Gordon Sim is a Canadian set decorator.

Francis Michael "King" Clancy was a Canadian professional ice hockey player, referee, coach and executive. Clancy played 16 seasons in the National Hockey League (NHL) for the Ottawa Senators and Toronto Maple Leafs. He was a member of three Stanley Cup championship teams and won All-Star honours. After he retired in 1937, he remained in hockey, becoming a coach for the Montreal Maroons. Clancy next worked as a referee for the NHL. He joined the Maple Leafs organization and worked in the organization as a coach and team executive until his death in 1986. In 2017 Clancy was named one of the '100 Greatest NHL Players' in history.

Jordan Carson Mark was a Canadian-American mathematician best known for his work on developing nuclear weapons for the United States at the Los Alamos National Laboratory. Mark joined the Manhattan Project in 1945, and continued to work at Los Alamos under the leadership of Norris Bradbury after World War II ended. He became the leader of the Theoretical Division at the laboratory in 1947, a position he held until 1973. He oversaw the development of new weapons, including the hydrogen bomb in the 1950s. On the hydrogen bomb project he was able to bring together experts like Edward Teller, Stanislaw Ulam and Marshall Holloway despite their personal differences.

Larry Towell is a Canadian photographer, poet, and oral historian. Towell is known for his photographs of sites of political conflict in the Ukraine, Nicaragua, El Salvador, Standing Rock and Afghanistan, among others. In 1988, Towell became the first Canadian member of Magnum Photos.

Robert Young is a serial entrepreneur who is best known for founding Red Hat Inc., the open source software company. He also owns the franchise for the Hamilton Tiger-Cats of the Canadian Football League and serves as self-styled Caretaker of the team. He was born in Hamilton, Ontario, Canada. He attended Trinity College School in Port Hope, Ontario. He received a Bachelor of Arts from Victoria College at the University of Toronto.

Kenneth Pogue was a Canadian actor.

Barbara Ann Underhill is a Canadian former pair skater. With partner Paul Martini, she is the 1984 World champion, the 1979–1983 Canadian national champion, and the 1978 World Junior champion. They represented Canada at the 1980 Winter Olympics, where they placed 9th, and at the 1984 Winter Olympics, where they placed 7th. In 2009, she was named to the World Figure Skating Hall of Fame. Since retiring, Underhill has worked as a skating coach for ice hockey players.

Greg Wells is a Canadian record producer, multi-instrumentalist, songwriter, and audio engineer. Wells has songs on over 130 million albums sold and streaming numbers in billions. He has produced and written with John Legend, Adele, Rufus Wainwright, The Greatest Showman: Original Motion Picture Soundtrack, Twenty One Pilots, Carrie Underwood, Deftones, Taylor Swift, Pharrell Williams, Dua Lipa, Keith Urban, Team Sleep, Katy Perry, Kid Cudi, Creeper Lagoon, Theophilus London, Ariana Grande, Weezer, OneRepublic, Kelly Clarkson, Pink, Otep, All American Rejects, Jars of Clay, Aerosmith, Mika, Grace VanderWaal, Jamie Cullum, Celine Dion, Crash Test Dummies, and music legends Quincy Jones, Elton John, Burt Bacharach, Andrew Lloyd Webber, and the Count Basie Orchestra.