IIA may refer to:
- Independence of irrelevant alternatives
- Indian Institute of Architects
- Indian Institute of Astrophysics
- Indianapolis International Airport
- Institute of Internal Auditors
- Information Industry Association
- International Investment Agreement
- Islamabad International Airport
- IIa or II-a, a subtype of Type II supernova
- A rating in the Hong Kong motion picture rating system
See also
- Iia, Estonia, village in Estonia
- 2A (disambiguation), including a list of topics named II-A, etc.
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