Historic Sportscar Racing

Historic Sportscar Racing (HSR) is an automobile club and sanctioning body that supports historic racing in the United States. The organization traces its roots to the first running of the Walter Mitty Challenge in 1977 at Road Atlanta. HSR continues to sanction the Mitty, along with six to 10 other events each year. The organization has been owned by the International Motor Sports Association (IMSA) since January 2022.

Events and venues

The organization is based in Clearwater, Florida, and sanctions races on the East Coast and Canada. Annual events include:
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