Other
- IA, The Journal of the Society for Industrial Archeology, an academic journal
- Individual augmentee, a U.S. military program for augmenting units with personnel from other organizations or branches of service
- Industrial archaeology, an archaeological discipline
- Initial appearance in a court of law, of a person charged with a crime
- Intermediate in Arts, an academic degree
- Internal affairs (law enforcement), a division of a law enforcement agency which investigates incidents and suspicions of lawbreaking and professional misconduct attributed to officers on the force
- Internal audit, a business profession specializing in the removal of impediments to organizational objectives
- International Arbiter, a chess title awarded by the World Chess Federation
- Intraarterial injection
- inter alia, a Latin phrase meaning "among other things"
- The prefix for aircraft manufactured in the Argentinian "Fabrica Argentina de Aviones" (formerly "Fabrica militar de Aviones") since 1952.
- Íþróttabandalag Akraness, an Icelandic football team playing in the Urvalsdeild.
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