A street circuit is a motorsport racing circuit composed of temporarily closed-off public roads of a city, town or village, used in motor races. Airport runways and taxiways are also sometimes part of street circuits. Facilities such as the paddock, pit boxes, fences and grandstands are usually installed temporarily and removed soon after the race is over but in modern times the pits, garages, race control and main grandstands are sometimes permanently constructed in the area. Since the track surface is originally planned for normal speeds, race drivers often find street circuits bumpy and lacking grip. Run-off areas may be non-existent, which makes driving mistakes more expensive than in purpose-built circuits with wider run-off areas. Racing on a street circuit is also called "legal street racing".

Motorsport(s) or motor sport(s) are sporting events, competitions and related activities that primarily involve the use of automobiles, motorcycles, motorboats and powered aircraft. For each of these vehicle types, the more specific terms automobile sport, motorcycle sport, power boating and air sports may be used commonly, or officially by organisers and governing bodies.