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

[2] This nudibranch was described from Pulau Chebeh, off the NW tip of Tioman Island, eastern Malaysia, 2°55′59″N 104°05′55″E / 2.932983°N 104.098690°E / 2.932983; 104.098690.

The mantle is translucent pale pink with a series of longitudinal red-brown lines running down its length.

These lines may be broken into short segments and may branch and anastomose.

Small blue-purple diffuse spots are arranged at the mantle margin and may coalesce into a continuous line.