Acanthurus reversus is a species of marine ray-finned fish belonging to the family Acanthuridae, which includes the surgeonfishes, unicornfishes and tangs.

There is an elongated orange spot running from the upper end of the gill slit With its, posterior have being surrounded by a blue band that reaches beyond the pectoral fin.

The caudal fin is light yellow with a wide black band to its rear, this narrows as it reaches the filamentous part of the lobes.

There is a record of an individual from Takaroa Atoll in the Tuamotu Archipelago but this is thought to have referred to a vagrant.

The Marquesas surgeonfish is found singly or in small groups on inshore reefs at depths between 4 and 25 m (13 and 82 ft).