Ayn

Ayn might refer to:

 Ayn, Savoie, a commune in the Savoie department in France
 Ayn, Somalia, a province in northern Somalia
 Ayn Rand, Russian writer
 Objectivism (Ayn Rand), a gradualist philosophy
 Wadi al Ayn, a wadi in Rub' al Khali, Oman