The county governor of Aust-Agder county in Norway represented the central government administration in the county. The office of county governor is a government agency of the Kingdom of Norway; the title was Amtmann and then Fylkesmann. On 1 January 2016, the office was merged with the county governor of Vest-Agder into the county governor of Aust- og Vest-Agder in preparation for the merger of the two counties on 1 January 2020.