Tusker Rock is a rock in the Bristol Channel, situated about 2 miles west of Ogmore-by-Sea, Bridgend, Wales. It takes its name from Tuska the Viking, a Dane whose fellow Vikings semi-colonized the Vale of Glamorgan just like his fellow Dane Sweyn Forkbeard and his followers founded Swansea and settled in the Gower Peninsula.
It is fully visible only at low tide, and was formerly a notorious hazard for ships.
On April 23, 1947 the SS Samtampa was wrecked nearby on Sker Point, leading to the loss of 39 officers and hands, plus eight of those of the crew of the Mumbles lifeboat while attempting a rescue. Today, the waters around Tusker Rock are a popular diving location.