IMSA

IMSA may refer to:

 Illinois Mathematics and Science Academy, a residential school located in Aurora, Illinois
 IMSA Performance, a French sports car racing team
 International Mind Sports Association, an association formed by the international federations of several intellectual games
 International Motor Sports Association and its namesake IMSA auto racing series headquartered in Braselton, Georgia.
WeatherTech SportsCar Championship, the premier sports car series resulting from the merger of Grand-Am Road Racing and the American Le Mans Series.
IMSA GT Championship, its flagship racing series from 1971 to 1998.
IMSA GT3 Cup Challenge
IMSA Prototype Lites
 International Municipal Signal Association, an association covering standards, certification, and training in areas of fire alarms, highway signs and markings, traffic signals, and roadway lighting