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, 1902–1925