IANA is an initialism that may stand for a number of things:
- the Internet Assigned Numbers Authority, an organisation that oversees IP address, Top-level domain and Internet protocol code point allocations
- IANA time zone database, the organisation that publishes a time zone database
- the Iranian Agriculture News Agency
- the Islamic Assembly of North America, a Muslim organization headquartered in Ann Arbor, Michigan
- the phrase "I am not a…", a common disclaimer in Internet slang, for example, IANAL (I am not a lawyer)
- the Intermodal Association of North America, the trade association for the intermodal freight transport industry