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

[2] This nudibranch is found in the Western Pacific Ocean from New Caledonia to Japan.

[3] Hypselodoris maritima has a white body with a yellow and blue mantle edge and foot.

There are black striated lines present on the upper dorsum.

[4] This species can reach a total length of at least 20 mm.