How many players are on the field in Canadian football if American football has 11 players on the field?

Canadian football is a sport played in Canada in which two teams of 12 players each compete for territorial control of a field of play 110 yards (101 m) long and 65 yards (59 m) wide attempting to advance a pointed oval-shaped ball into the opposing team's scoring area (end zone).

In Canada, the term "football" may refer to Canadian football and American football collectively, or to either sport specifically, depending on context. The term "gridiron football" (or, more rarely, North American football) is also used worldwide as well to refer to both sports collectively. The two sports have their origins in rugby football, but some key differences exist.

American teams use 11 players, while Canadian teams have 12 players on the field per side. Both games have the same number of offensive players required at the line of scrimmage, so the 12th player in the Canadian game plays a backfield position on offence, whereas this is usually a defensive back on defence.