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IMSA is the International Motor Sports Association, an auto racing governing body headquartered in Daytona Beach, Florida, United States.

IMSA may also refer to:

International Motor Sports Association

• IMSA SportsCar Championship, International Motor Sports Association's flagship racing series from 2014 to present.
• IMSA GT Championship, International Motor Sports Association's flagship racing series from 1971 to 1998.
• IMSA GT3 Cup Challenge
• IMSA Prototype Challenge

Other motorsport

• IMSA Performance, a French sports car racing team competing in European Le Mans series

Other

• Illinois Mathematics and Science Academy, a residential school located in Aurora, Illinois
• Indigenous Marine Stewardship Area
• International Mind Sports Association, an association formed by the international federations of several intellectual games
• 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