Adarnase III of Tao (died 896) was a Georgian prince of the Bagratid dynasty of Tao-Klarjeti and hereditary ruler of Tao with the title of eristavt-eristavi, "duke of dukes".
Adarnase was the oldest son of Gurgen I of Tao upon whose death in a dynastic strife he succeeded in 891. Adarnase's tenure was short-lived. He died six years after his accession, leaving two sons and a daughter behind: