Glossodoris acosti is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Chromodorididae.

[2] The type locality for species is Rempi, Madang Province, Papua New Guinea.

Paratypes from the Philippines are included in the original description.

Probably widespread in the central Indo-Pacific Ocean.

[1] Previously confused with Glossodoris cincta this species is distinguished by details of colouring and internal anatomy as well as DNA sequences from other species of very similar appearance.