There are many, many famous people who are from Ontario. These people have become famous for a variety of reasons.
From the world of entertainment, there are a number of famous singers. These include singers from some years back such as Paul Anka and Bryan Adams. They also include Justin Bieber who is popular today. There are also a number of actors and other people connected with film. James Cameron, who directed Titanic, and who more recently became the first person to descend on his own to the bottom of the Marianas Trench is from Ontario. Comic actors Jim Carrey, Mike Myers and John Candy (deceased) are all from Ontario.
There are many sports stars from Ontario. The most notable of these would be the hockey players Bobby Orr, Wayne Gretzky, and Eric Lindros. Elvis Stojko, who won two silver medals in figure skating in the Olympics, is from Ontario as well.
In the world of medicine, Sir Frederick Banting and Dr. Charles Best are from Ontario. Banting won the Nobel Prize in Medicine for helping to discover (along with Best) insulin.
These are a few of the more famous people from Ontario.