Jeju may refer to:

• Jeju Island (Jejudo), South Korea
• Jeju Province (formerly transliterated Cheju), a province of South Korea comprising Jejudo
  • Jeju City, its capital
  • Jeju dog, a dog native to Jejudo
  • Jeju language
  • The Jeju people
  • Jeju Black, a cattle breed from the island
  • Jeju horse
• Jeju Air, an airline operating from Jejudo
• Jeju Bank, a subsidiary of Shinhan Bank

• Jeju (woreda), a district in Oromia Region, Ethiopia
• Hoplerythrinus unitaeniatus, an Amazonian fish known as jeju

• Jeju Shinhwa World, a South Korean resort on Jeju Island