IGA
- IGA Supermarkets
- IGA, Inc.
- Iga (disambiguation)
- Illinois General Assembly
- Immunoglobulin A
- Imperial German Army
- In-game advertising
- Indian Gaming Association
- Indiana General Assembly
- International Gamers Award
- International Grenfell Association
- International Island Games Association
- International Lesbian, Gay, Bisexual, Trans and Intersex Association
- Iowa General Assembly
- Irish Games Association
- Islamic Golden Age
- Koji Igarashi