List of Famous people born in Ontario, Canada

Gérald Tremblay is a Canadian former politician and businessman who served as mayor of Montreal from 2002 until his resignation in 2012. He also served as president of the Montreal Metropolitan Community. Before becoming mayor he had a long career in business and management. Tremblay resigned as Mayor on November 5, 2012 following allegations of corruption made at the Charbonneau Commission.

Michael "Monkey" Boisvert is a Canadian actor and choreographer.

William Terrence McGrattan is the eighth and current bishop of the Diocese of Calgary. He was an auxiliary bishop for the Archdiocese of Toronto and titular bishop of Furnos Minor before being appointed Bishop of the Diocese of Peterborough.

Paul James Cosgrove,, is a former Canadian jurist as well as a former politician.

Stephen R. Hart is a Canadian actor known for his height (6'11") and deep voice. He is also known for his role as "The Voice" on The Current. Hazel-eyed, with pitch black hair and clothes, Hart has a reputation for playing sinister villains. His credits include notable films such as Resident Evil: Apocalypse, Silent Hill, Shoot 'Em Up and Max Payne. He also played the main antagonist in an episode of the NBC series Fear Itself.

Robert Douglas "Rob" Nicholson is a Canadian politician who represented the riding of Niagara Falls in the House of Commons of Canada from 2004 to 2019 as a member of the Conservative Party. Under Prime Minister Stephen Harper, he served as Minister of National Defence, Minister of Justice, Minister of Foreign Affairs, and Leader of the Government in the House of Commons. When the Harper Government ended, he was appointed Justice Critic in the Official Opposition shadow cabinet.

Jonathan Malen is a Canadian actor. He provides the voice for Jimmy Z in Wild Kratts.

John Gilbert was a Canadian lawyer, politician and jurist.

Maud Leonora Menten was a Canadian bio-medical and medical researcher who made significant contributions to enzyme kinetics and histochemistry. She is primarily known for her work with Leonor Michaelis on enzyme kinetics in 1913. The paper has been translated from its original German into English.