Pycnochromis acares is a species of damselfish that is native to the Pacific Ocean.

[2] Their distribution ranges from Japan to Hawaii, Vanuatu, and the Austral Islands.

[2] Adults of this species can grow up to a maximum size of up to 4 centimetres (1.6 in).

[2] They exhibit white with a yellow blotch that extends from the eye to the pectoral fin.

This species of damselfish occurs in big to small aggregations above coral heads or rubble.