List of Famous people born in Ontario, Canada

Harry Gordon Johnson, was a Canadian economist who studied topics such as international trade and international finance.

Harry Hemley Plaskett FRS was a Canadian astronomer who made significant contributions to the fields of solar physics, astronomical spectroscopy and spectrophotometry. From 1932 to 1960, he served as the Savilian Professor of Astronomy at the University of Oxford, and in 1963 was awarded the Gold Medal of the Royal Astronomical Society.

James Greig Arthur is a Canadian mathematician working on automorphic forms, and former President of the American Mathematical Society. He is a Mossman Chair and University Professor at the University of Toronto Department of Mathematics.

Ashley Leggat is a Canadian actress. She is known for her roles as Casey McDonald in the Canadian family comedy series Life with Derek and as Ashley Dunnfield in the television movie The Perfect Roommate.

Lou Jacobi was a Canadian character actor.

John Herbert Chapman was a Canadian space researcher. He started his career with his work on radio propagation and the ionosphere.

Robert McCammon is a Canadian retired professional ice hockey centre and a former National Hockey League (NHL) and American Hockey League (AHL) head coach and general manager. He was a pro scout with the Detroit Red Wings.

Diane Finley is a Canadian politician. From 2006 though 2015, she served in the cabinet of Prime Minister Stephen Harper. Her ministerial portfolios included Minister of Human Resources and Skills Development, Minister of Public Works and Government Services, Minister Responsible for Canada Mortgage and Housing Corporation, or CMHC, and Minister of Citizenship and Immigration. She is a member of the House of Commons of Canada, representing the riding of Haldimand—Norfolk for the Conservative Party. In August 2020, she announced that she will not be running in the next general election.

John Richard Bond, also known as J. Richard Bond, is a Canadian astrophysicist and cosmologist.

Robert William Runciman, is a veteran Canadian politician and former provincial Leader of the Opposition in the Ontario Legislature. First elected to the Legislative Assembly of Ontario in 1981, he held the seat continuously for Progressive Conservative Party of Ontario for the next 29 years. On January 29, 2010, he was appointed to a federal legislative position as a Conservative to the Senate of Canada where he served until August 10, 2017.