NGA

Nga (Indic), a glyph in the Brahmic family of scripts

Nga (Javanese) (ꦔ), a letter in the Javanese script

Ngā, the (plural) definite article in the Māori language

=== US-based ===

National Gallery of Art, museum in Washington, DC

National Geospatial-Intelligence Agency, United States combat support agency

National Giving Alliance (formerly Needlework Guild of America and NGA, Inc.), an American clothing donation charity

National Golf Association, a former developmental golf tour

National Governors Association, political organization for leaders of states, federal territories, and commonwealths

National Greyhound Association, a registry for purebred greyhounds

National Gym Association, a non-profit promoting all-natural bodybuilding

National Gallery of Australia, museum in Canberra

National Governors' Association (UK charity), an English charity relating to school governors

National Graphical Association, a British trade union

BBC Radio 3 New Generation Artists scheme, a talent scheme run by BBC Radio 3

Nigeria, by ISO 3166-1 three-letter (alpha-3) code

Young Airport, New South Wales, Australia, IATA airport code "NGA"

Nga (god), a Siberian deity

Nga people, a tribal group of Arunachal Pradesh

Natural Gas Act of 1938, first regulation of the natural gas industry by the United States federal government

Next generation access, fibre optic broadband