List of Famous people born in Ontario, Canada

Lawrence Robert O'Brien is a Canadian businessman and politician. O'Brien served as the 58th mayor of Ottawa, Ontario, Canada from 2006 until 2010. O'Brien was the founder and former Chair and CEO of Calian Technologies Ltd.

Ronald D. Sugar is an American business executive. He served as the chairman of the board and chief executive officer of the Northrop Grumman Corporation from 2003 to 2009. On August 1, 2018 he was unanimously elected as independent Chairman of Uber.

Hugh Guthrie, was a Canadian politician and Cabinet minister in the governments of Sir Robert Borden, Arthur Meighen and R. B. Bennett.

Niamh Wilson is a Canadian film and television actress from Oakville, Ontario, known for her role as Corbett in Saw III, reprised in Saw V; the Canadian horror film The Marsh (2006); and the title role in the Family Channel series Debra!

Ron Richards is a Canadian former ski jumper. He represented the Canadian national team at the 1984 Winter Olympics in Sarajevo, Yugoslavia; the 1988 Winter Olympics in Calgary, Canada; and the 1992 Winter Olympics in Albertville, France. Richards is also an avid golfer.

Robert Charles Walton was a Canadian professional ice hockey player in the World Hockey Association (WHA).

Iain Sydie is a badminton player from Canada, who won the silver medal in the inaugural men's singles competition at the 1995 Pan American Games. He also took away a gold from that tournament. A resident of Calgary, Alberta, he represented Canada at the 1996 Summer Olympics. Together with his mixed doubles partner Denyse Julien, they become the first North American players to gain a top ten world ranking in February 1998.

James Winslow Mortimer was a Canadian comic book and comic strip artist best known as one of the major illustrators of the DC Comics superhero Superman. He additionally drew for Marvel Comics, Gold Key Comics, and other publishers.