NIAA

NIAA may refer to:


 * National Indigenous Australians Agency, an Australian government agency formed 2019
 * National Indigenous Arts Awards, Australia
 * Nebraska Intercollegiate Athletic Association, American intercollegiate athletic conference, 1928–1942
 * Nevada Interscholastic Activities Association, an association in Nevada, United States
 * Northern Ireland Association of Aeromodellers, an organization in Northern Ireland, United Kingdom
 * Northwest Intercollegiate Athletic Association, an amateur athletics federation in the United States, 1902–1914