Ga or ga may stand for:

• The Ga, an ethnic group of Ghana
• Ga language, the spoken by the Ga
• gallium (Ga), symbol for the chemical element
• Georgia (abbreviation for the U.S. state, Ga.)
• Irish language (ISO 639 alpha-2), from Irish Gaeilge
• Ga, a symbol for billion (1 000 000 000) years. (See Giga)

See also: GA