List of Famous people born in Ontario, Canada

Raine Maida is a Canadian musician best known as being the lead vocalist and primary songwriter of the alternative rock band Our Lady Peace. He has come to be known for his unique countertenor nasal falsetto singing voice, as well as his cryptic and poetry-influenced song lyrics. He occasionally plays certain instruments, such as the acoustic guitar, while performing with Our Lady Peace. Following guitarist Mike Turner's departure from Our Lady Peace in 2001, Maida is the only remaining original member of the band.

Christopher David Naylor, is a Canadian physician, medical researcher and former president of the University of Toronto. He is ICES scientist emeritus and founding CEO. In 2016, he was inducted into the Canadian Medical Hall of Fame.

Robert James Sawyer is a Canadian science fiction writer. He has had 23 novels published, and his short fiction has appeared in Analog Science Fiction and Fact, Amazing Stories, On Spec, Nature, and many anthologies. Sawyer has won the Nebula Award (1995), the Hugo Award (2003), and the John W. Campbell Memorial Award (2006).

Stanley Edwin Daniels was a Canadian-American screenwriter, producer and director, who won eight Emmy Awards for his work on The Mary Tyler Moore Show and Taxi.

Evelyn Merle Nelson, born Evelyn Merle Roden, was a Canadian mathematician. Nelson made contributions to the area of universal algebra with applications to theoretical computer science. She, along with Cecilia Krieger, is the namesake of the Krieger–Nelson Prize, awarded by the Canadian Mathematical Society for outstanding research by a female mathematician.

Walter Lockhart Gordon was a Canadian accountant, businessman, politician, and writer.

Chris Viehbacher is a German-Canadian businessman. He served as the Chief Executive Officer of Sanofi and Chairman of Genzyme until 29 October 2014. Viehbacher is currently Managing Partner of Gurnet Point Capital, a healthcare venture capital and private equity fund backed by Ernesto Bertarelli and his family.

Robert Laing Noble was a Canadian physician who was involved in the discovery of vinblastine.

Arthur Meighen was a Canadian lawyer and politician who served as the ninth prime minister of Canada from 1920 to 1921 and from June to September 1926. He led the Conservative Party from 1920 to 1926 and from 1941 to 1942.

Sydney Cecil Newman, OC was a Canadian film and television producer, who played a pioneering role in British television drama from the late 1950s to the late 1960s. After his return to Canada in 1970, Newman was appointed Acting Director of the Broadcast Programs Branch for the Canadian Radio and Television Commission (CRTC) and then head of the National Film Board of Canada (NFB). He also occupied senior positions at the Canadian Film Development Corporation and Canadian Broadcasting Corporation, and acted as an advisor to the Secretary of State.