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IIA may refer to:
- Independence of irrelevant alternatives
- Indian Institute of Architects
- Indian Institute of Astrophysics
- Indianapolis International Airport
- IIA - Industria Italiana Autobus S.p.A.
- Institute of Internal Auditors
- Information Industry Association
- International Investment Agreement
- Islamabad International Airport
- IIa or II-a, a subtype of Type II supernova
| disambiguation page lists articles associated with the title IIA.
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