Ynys Môn may refer to:
Anglesey (), 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 former coterminous seat in the Senedd (Welsh Parliament) Isle of Anglesey County Council, the local government authority for the island
See also Mon (disambiguation) Anglesey (disambiguation)