Jeju may refer to:
- Jeju Island (Jejudo), an island near South Korea
- Jeju Province (formerly transliterated Cheju), a province of South Korea comprising Jejudo
- Jeju Volcanic Island and Lava Tubes, a UNESCO World Heritage Site
- Jeju Air, an airline operating from Jejudo
- Jeju Bank, the old name of Shinhan Bank
- Jeju (woreda), one of the 180 woredas district in the Oromia Region of Ethiopia
- Jeju Shinhwa World, a fully integrated South Korean resort located on Jeju Island
- Hoplerythrinus unitaeniatus, an Amazonian fish known as jeju
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