Jeju may refer to:
- Jeju-do, a province of South Korea
- Jeju Island, the main island of Jeju-do (province)
- Jeju Air, an airline of Jeju
- Jeju City, the biggest city on Jeju-do (island) and capital of Jeju-do (province)
- Jeju dog, a dog native to Jeju-do
- Jeju (woreda), one of the 180 woredas in the Oromia Region of Ethiopia