Canadian Tire Motorsport Park, Motorsport racing track in Bowmanville, Ontario, Canada

Canadian Tire Motorsport Park is a permanent circuit in Bowmanville, east of Toronto in the province of Ontario. The track measures around 4.1 km and runs through ten corners over gently rolling terrain with natural rises and dips.

The course opened in 1961 under the name Mosport Park and hosted several editions of the Canadian Grand Prix in Formula One from 1967 to 1977. After changes of ownership, the facility received its current name in 2012.

The facility takes its name from a well-known Canadian retailer with long-standing involvement in motorsport. On race days, fans gather in the grandstands to follow the action on the circuit, while driver schools between events introduce students to racing technique.

The venue lies around 75 km east of Toronto and offers camping areas, grandstands, and concessions for visitors during the racing season. First-time visitors find orientation easiest near the main grandstand, which provides views over much of the course.

Mosport was Canada's second purpose-built road course, following Westwood in Coquitlam, British Columbia. Its name is a portmanteau of Motor Sport, coined by the company formed to build the track, which is why many people mistakenly call it Mossport. The hairpin originally planned for turn five became two tight corners at Stirling Moss's suggestion and bears his name.