WGA is a three-letter abbreviation for:
- Writers Guild of America, an American union
- Writers Guild of America, East
- Writers Guild of America, West
- Web Gallery of Art
- Western Golf Association
- Western Governors Association, a group of American governors
- IATA code for Wagga Wagga Airport
- Windows Genuine Advantage
- Whole genome amplification
- Whole genome association study
- Word Gets Around, the debut album by Stereophonics
- Wish Gone Amiss Weekend - A 3-part crossover show on Disney Channel
- Whole of Government Accounts - accruals based accounts covering the whole of the UK public sector
- World Canadian Bureau, a fictional group (abbreviated "WGA" as a shot at the Writers Guild of America) from the South Park episode "Canada on Strike"
- Phoenix-Mesa Gateway Airport, formerly called Williams Gateway Airport
- Wheat Germ Agglutinin
- Writers Guild of Alberta