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
This disambiguation page lists articles associated with the title NIAA.
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