IAT
- ACH Network
- Certified Information Systems Security Professional
- IISER Aptitude Test
- Iat
- Immigration Appeal Tribunal
- Implicit-association test
- Import Address Table
- Indicated air temperature
- Indigenous Aryan Theory
- Indirect antiglobulin test
- Indonesia Air Transport
- Information access
- Institut aérotechnique
- Institute for Affordable Transportation
- Institute of Armament Technology
- International Appalachian Trail
- International Association of Trichologists
- International Atomic Time
- Iwate Asahi Television
- Kelappaji College of Agricultural Engineering and Technology
- Royal International Air Tattoo