Bernard Ato VI (born c. 1159) was the posthumous son and successor of Bernard Ato V, and . He reigned from 1163 until 1214, when he surrendered his fiefs to Simon de Montfort, Earl of Leicester and leader of the Albigensian Crusade. Bernard Ato was not connected with Catharism nor were his lands, but his relationship to Raymond Roger Trencavel (his first cousin) may have marked him off as an enemy of the Crusade by default, for he was a Trencavel, though he did not carry that name.