The All Japan Sports Prototype Championship (全日本スポーツプロトタイプ選手権), abbreviated as JSPC, formed by the Japan Automobile Federation, was a domestic championship which took place in Japan for Group C and IMSA GTP prototype cars and also featured cars that were eligible for touring car racing in its earlier years.

The series was noted throughout its ten-year run for battles between the various Porsche 956/962C and Japanese manufacturers presented by works teams of Toyota, Nissan and Mazda.

Due to waning popularity and seeking to prevent the spiraling budgets and the disappearance of Gr.

C and IMSA GTP, the JAF would dissolve the series at the end of 1992 and for the following year replace the series with the All Japan Grand Touring Car Championship, using GT cars such as those in secondary classes as major international sportscar series worldwide favoured the grand tourers (similar to IMSA's lower GTS and GTU classes).

This was not to be the end for Group C cars as they would be allowed to compete in the newly formed series for two more years before being banished altogether.