Ayun may refer to:
- 'Ayūn, a component or Arabic placenames meaning springs, fountains, sources
- An alternative form of El Aaiún, a city in Western Sahara
- Ayun (woreda), a district of Somali Region, Ethiopia
- Ayun, Chitral, a valley in Pakistan
- Ayun Halliday (born 1965), American writer and actor