Iju or IJU may refer to:
- Iju, Ogun, a town in southern Ogun, Nigeria
- Islamic Jihad Union, an Islamic terrorist group
- Indian Journal of Urology
- Ijuí Airport, Brazil (IATA code)
- Hallaxa iju, a species of sea slug
People with the surname
- Minami Iju (伊集 南, born 1990), Japanese women's basketball player
- Seiichi Iju, Japanese martial artist