The River Erriff (Irish: Abhainn na hOirimhe)[2] is a river in Ireland, flowing through County Mayo.

[3] A spate river, it is characterised by lively streams and deep fish-holding pools.

It flows west-southwest parallel to the N59, passing under Aasleagh Bridge and entering Killary Harbour.

The River Erriff is a noted salmon and trout fishery.

This article related to a river in Ireland is a stub.