Idun is an alternate spelling of Iðunn, a goddess in Norse mythology.
It may also refer to: Places alternate spelling of Aydoun, a Jordanian city Idun Peak, Antarctica Idun Township, Aitkin County, Minnesota
People Idun Reiten (1942–2025), Norwegian professor of mathematics Connor Idun (born 2000), Australian rules footballer James Idun (born 1963), Ghanaian sprinter
Other uses Idun Industri, a Norwegian company Livsforsikringsselskapet Idun, a Norwegian company Idun (magazine), a Swedish magazine Viking Idun, a Viking Cruises ship Idun (horse), American racehorse Idun language of Nigeria Idun (icebreaker), a Swedish icebreaker