Alun may refer to:
Places Alun, a village in Boșorod Commune, Hunedoara County, Romania Alun (Hungarian: Álun), a village in Bunila Commune, Hunedoara County, Romania Alun River, Romania Afon Alun, a river in the Vale of Glamorgan, Wales River Alyn, also known as the River Alun, Wales River Alun, Pembrokeshire, Wales
Other uses Alun (given name)
See also Alun-alun, Javanese architectural term for the large central open lawn squares common to villages, towns and cities in Indonesia