The Winchester 400 is a 400-lap short-track super late model stock car race held each fall at the Winchester Speedway, a half-mile long paved oval motor racetrack in Winchester, Indiana, United States. Held annually since 1970, the Winchester 400 started off as an American Speed Association event. Later it became part of the NASCAR Southeast Series from 1992 to 1998. It returned to the ASA National Tour from 2000 to 2002. The event is sanctioned by the ARCA/CRA Super Series since 2003, and in 2023 it will be co-sanctioned by the new ASA STARS National Tour.

Winchester Speedway is a half-mile paved oval motor racetrack in White River Township, Randolph County, just outside Winchester, Indiana, approximately 90 miles (145 km) northeast of Indianapolis. It seats 5,000 spectators. It is also known as the "World's Fastest 1/2 mile".