Errisbeg Mountain or Errisbeg () is a hill in Roundstone, County Galway, in the West of Ireland, with a height of 300 m. The mountain is located within the Gaeltacht of Conamara Theas, alongside nearby Inishnee.

The summit has views of both the Roundstone bog and the Atlantic. On a clear day the Aran Islands are visible to the south and Clifden and the Twelve Bens to the North.

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