1990 IMSA GT Championship

It consisted of GTP and Lights classes of prototypes, as well as Grand Tourer-style racing cars which ran in the GTO and GTU classes,[1] as well as a tube-frame All-American Challenge (AAC) class during select GT-only rounds.

It began on February 3, 1990, and ended November 11, 1990, after twenty rounds.

The AAC class only participated in GT-only events.

Races marked with All had all classes on track at the same time.

Only the highest-ranking entry from a manufacturer was awarded points at each event.