IA
- ia – (s) Interlingua language (ISO 639-1 code)
- IA – (s) Iowa (postal symbol)
- IAAF – (i) International Association of Athletics Federations ("International Amateur Athletics Federation" from 1912 to 2001)
- IAAL – (i) I Am A Lawyer
- IAB – (i) International Association for Biologicals
- IACREOT – (i) International Association of Clerks, Recorders, Election Officials, and Treasurers
- IAD – (i) Ion Assisted Deposition
- IADS – (i) Integrated Air Defence System
- IAEA – (i) International Atomic Energy Agency
- IAF – {i} Industrial Areas Foundation
- IAFG – (i) Information Assurance Focus Group
- IAI – (i) International African Institute – Israel Aircraft Industries
- IANA – (i) Internet Assigned Numbers Authority
- IANAL – (i) I Am Not A Lawyer
- IAQ – (i) Indoor air quality – Infrequently Asked Questions
- IAS – (i) Image Assessment System
- IASIP – (i) It's Always Sunny in Philadelphia
- IATA – (a/i) International Air Transport Association
- IATF – International Automotive Task Force
- IATSE - International Alliance of Theatrical Stage Employees
- IAU – (i) International Association of Universities – International Astronomical Union
- IAUC – (i) International Astronomical Union Circular
- IAW – (i) In Accordance With
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