Roscam, Medieval monastery ruins in County Galway, Ireland

Roscam is a medieval ecclesiastical site and National Monument in County Galway, 4 km east of Galway city centre and just north of Oranmore Bay. Its large enclosure holds a limestone round tower 11 m tall that appears never to have been completed, bullauns, and a church 22 m long.

Roscam stands on the site of a monastery founded in the 5th century, which legend links to Saint Patrick. It was later associated with Odran, brother of Ciarán of Clonmacnoise, and in the 6th century Saint Aedus transferred the bones of Brión mac Echach Muigmedóin there. Vikings attacked the monastery in AD 807. The round tower dates to the 11th century and the church was built in the 15th century.

Roscam is named after the site itself, not a saint; the surrounding Galway neighbourhood borrowed the name from the ruins. Tradition ties the monastery to Saint Patrick, to Odran, brother of Ciarán of Clonmacnoise, and to Saint Aedus, who brought the bones of Brión mac Echach Muigmedóin here. Visitors can still see bullauns, the small stone basins cut into rock.

Roscam lies about 4 km east of Galway city centre, just north of Oranmore Bay and south of the modern Galway suburb that shares its name. The ruins stand on open ground within a large enclosure, so wear footwear for wet grass and bring rain gear.

The round tower is about 11 m (36 ft) tall and was built in the 11th century, but it appears never to have been completed. It once marked the limit of O'Halloran (Ó hAllmhuráin, Clann Fhearghaile) territory. The site lies 4 km east of Galway city centre, just north of Oranmore Bay.