IA
- 1A (disambiguation)
- AI (disambiguation)
- Arthur Quiller-Couch
- Artificial intelligence
- August 4
- Cyrillic
- Fabrica Militar de Aviones
- Gordon Pask
- H. P. Lovecraft
- IA (chemotherapy)
- IA (software)
- IA, The Journal of the Society for Industrial Archeology
- IA-32
- IA-64
- Ia (cuneiform)
- Ia (genus)
- Ia of Cornwall
- Immunoassay
- Impact assessment
- Implicit authentication
- Indecent assault
- Indian Airlines
- Indian Army
- Indiana
- Indiana Academy
- Individual augmentee
- Indonesian Army
- Industrial archaeology
- Information architecture
- Information assurance
- Inshallah
- Institute of Archaeology, Chinese Academy of Social Sciences
- Insurance Authority
- Intelligent agent
- Inter alia
- Interlingua
- Intermediate in Arts
- Internal affairs (disambiguation)
- Internal audit
- International Academy
- International Alliance of Theatrical Stage Employees
- International Artists
- International relations
- Internet Archaeology
- Internet Archive
- Iowa
- Iraqi Airways
- Iá River
- Mattias Eklundh
- Mazda2
- Muslims
- Oia, Greece
- Phases of clinical research
- Romanization
- September 11 (Eastern Orthodox liturgics)
- Type Ia supernova
- Ya (Cyrillic)
- Íþróttabandalag Akraness