Ynys Môn

Ynys Môn may refer to:


 * Anglesey (Ynys Môn), an island of north-west Wales in the Irish Sea
 * Ynys Môn (UK Parliament constituency), the island's House of Commons electoral seat
 * Ynys Môn (Senedd constituency), its coterminous seat in the Welsh Parliament or Senedd Cymru
 * Isle of Anglesey County Council, the local government authority for the island