EIIR or variation, may refer to:
- E II R|, royal cypher of Elizabeth II derived from Latin "Elizabeth II Regina"
- European Institute for International Law and International Relations
- Inisheer Aerodrome (ICAO airport code: EIIR), Inisheer Island, Ireland<!--
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- Electrical Engineering - Innovation and Intelligent Robotics (EIIR) program, at the Thai university in Bangkok, Kasetsart University -->
See also
- Elizabeth II (disambiguation)
- ER2 (disambiguation)
- EIR (disambiguation)