Ayn may refer to:
Ayin or (ع), an Arabic letter
Ayn, Savoie, a commune of the
Savoie département' of France
Ayn, Somalia (or Cayn), a region defined by the autonomous state of Puntland
Anarchist Youth Network, a UK anarchist organisation
Ghayn (Ғ,ғ), a letter used in the Kazakh, Uzbek, and Azerbaijani alphabets
Ayn Rand, Russian-born American novelist and philosopher
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