Irish round tower

Irish round towers (Irish: Cloigtheach (singular), Cloigthithe (plural); literally 'bell house') are early medieval stone towers of a type found mainly in Ireland, with two in Scotland and one on the Isle of Man. As their name Cloigtheach indicates, they were originally bell towers, though they may have been later used for additional purposes.

A tower of this kind is generally found in the vicinity of a church or monastery, with the door of the tower facing the west doorway of the church. Knowledge of this fact has made it possible, where towers still exist, to determine without excavation the approximate sites of lost churches that once stood nearby.