Hypselodoris maculosa is a species of sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.

[3] A study employing DNA sequencing and more careful comparison of morphological differences revealed that many of these colour variations were in fact separate species.

[4] Hypselodoris maculosa has a cream body with a brown margin to the mantle and four longitudinal white lines on its dorsum.

The anterior end of the mantle and the part behind the gills are light-purple in colour with white and dark purple spots.

[4] This species can reach a total length of at least 32 mm[1] and has been observed feeding on grey sponges from the genus Euryspongia.