The Mazda 737C was a prototype racing car built by Mazdaspeed for the 24 hours of Le Mans auto race. It replaced the 727 in 1985 and was replaced by the 757 the next year. It used a 2-rotor 13B Wankel engine, similar to the production engine in the Mazda RX-7.

Two 737s were entered at Le Mans in 1985, finishing nineteenth and twenty-first.