NGA may refer to:
- BBC Radio 3 New Generation Artists scheme, a talent scheme run by BBC Radio 3
- National Gallery of Art in the US
- National Gallery of Australia
- National Geospatial-Intelligence Agency, an intelligence agency of the United States
- National Giving Alliance (formerly Needlework Guild of America and NGA, Inc.), an American clothing donation charity
- National Golf Association in the US
- National Governors Association, a US-based organisation for State Governors
- National Governors' Association (UK charity), an English charity relating to school governors
- National Graphical Association, a British trade union
- National Greyhound Association in the US
- National Gym Association
- Natural Gas Act of 1938
- Next generation access, fibre optic broadband
- Ngā, the (plural) definite article in the Māori language
- Nga (god), a Siberian deity
- Nga (Indic), a glyph in the Brahmic family of scripts
- Nga (Javanese) (ꦔ), a letter in the Javanese script
- Nga people, a tribal group of Arunachal Pradesh
- Nigeria, by ISO 3166-1 three-letter (alpha-3) code
- Young Airport, IATA airport code "NGA"