The Watch Tower is a tower on Manor Street in Waterford, Munster, Ireland. It is one of the six surviving towers of the city walls of Waterford. The cylindrical shape of the tower suggests that it was built in the 13th century. The arrow slit openings, or embrasures, with a gun loop at the bottom indicate that the tower was modified in the 15th or 16th century to facilitate artillery operations. The tower does not have any windows on the city side; it was built solely as a defensive structure without a secondary use as a dwelling. At the rear of the tower there are two entrances, one at ground level and another at wall-walk level.