Ga may refer to:
- The Ga, an ethnic group of Ghana
ga or GA may stand for:
Look up ga in Wiktionary, the free dictionary.
- Giga-annum (Ga), a time period of one billion (109) years
- Ga language, spoken by the Ga
- Gabon, ISO 3166-1 alpha-2 country code
- gallium (Ga), symbol for the chemical element
- Garuda Indonesia, IATA code of the airlines
- general assembly
- General Aviation, all aviation except commercial carriers and military
- Genetic algorithm
- Georgia, abbreviation for the U.S. state (GA, Ga.)
- Germantown Academy (GA), America's oldest nonsectarian day school
- Irish language, the ISO 639 alpha-2 code, from Irish Gaeilge
- Tabun ("GA"), a nerve agent
- Girls Aloud, a British girl group, winners of Popstars: The Rivals.
- Galaxy Angel
General authority