Castletroy (Irish: Caladh an Treoigh, meaning O'Troy's Landing or O'Troy's Callow) is a suburb of Limerick, Ireland. The town was named after Castle Troy also known as The Black Castle, which is located on the southern bank of the River Shannon, roughly 2km East of the University of Limerick. However the name likely predates the castle itself as the area may have been used by the O’Turrain clan (who were no longer in the area by the time the castle was built) having used it as a safe harbour for navigating the river.