IU
- Ho Chi Minh City International University
- I U (EP)
- IU (entertainer)
- IU International University of Applied Sciences
- Ilam University
- Independence University
- Indiana Hoosiers
- Indiana University
- Indiana University Bloomington
- Instruction unit
- Inter-universal Teichmüller theory
- Intermediate Unit
- International University, Cambodia
- International unit
- Intonational unit
- Inuktitut language
- Islamabad United
- Islamic University, Bangladesh
- Isra University, Hyderabad
- Istanbul University
- Ittihad University
- Izquierda Unida (Argentina)
- Izquierda Unida (Spain)
- RANAP
- Saturn V instrument unit
- Super Air Jet
- The IU