WIAA

WIAA may refer to:


 * Wisconsin Interscholastic Athletic Association
 * Washington Interscholastic Activities Association
 * WIAA (FM), a radio station (88.7 FM) licensed to Interlochen, Michigan, United States
 * Western India Automobile Association, an automobile association headquartered in Mumbai
 * Women's International Association of Aeronautics, founded in 1929 by Elizabeth Lippincott McQueen