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

It is a warm temperate species only found in Southeastern Australia.

It is related to the widespread tropical species Hypselodoris infucata and the similar Australian species Hypselodoris saintvincentius.

[4] Hypselodoris obscura has a mottled appearance due to a grey or grey-blue background colour with yellow and black spots, which vary considerably in size between individuals.

The edge of the mantle is pale blue alternating with yellow.