West Mouse (Welsh: Maen y Bugael) is an islet lying off the north-east coast of Anglesey, Wales.
At latitude 53° 25′ 0″ North, longitude 4° 32′ 60″ West it is in an area of notoriously strong tides. Because of this, at least three shipwrecks lie near it, making it a popular diving location. The area is also host to species such as hornwrack, sea squirts and conger eels.
