Attacotti, Atticoti, Attacoti, Atecotti, Atticotti, and Atecutti were Latin names for a people first recorded as raiding Roman Britain between 364 and 368, alongside the Scoti, Picts, Saxons, Roman military deserters and the indigenous Britons themselves. The marauders were defeated by Theodosius in 368.
The exact origins of the Attacotti and the extent of their territory are uncertain. In about 400, Roman units recruited among the Attacotti were recorded in the Notitia Dignitatum, and one tombstone of a soldier identified as such is known. Their existence as a distinct people is given additional credence by two incidental claims that they practised cannibalism and polyandry ("wives in common") in the writings of Saint Jerome.