IGA
IGA may stand for:
- Iga Province, Japan
- IgA or immunoglobulin A - see also IgA nephritis which is a renal disease
- IGA (supermarkets) Independent Grocers Association or Independent Grocers Alliance
- IGA Supermarkets in Australia - the above in Australia
- International Geothermal Association
- Independent Glass Association
- Interactive genetic algorithm
- International Gothic Association
- International Gamers Award
- International Goat Association
- Irish Games Association
- Irish Geological Association
- Island Games Association
- Koji Igarashi, a video game producer
- List of Japanese surnames Iga is a Japanese surname