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

[2] This nudibranch is found in Southeastern Australia from Queensland to Victoria.

[3] H. bennetti has a translucent white body which may have a blue, pink or purple hue, and a bright yellow mantle edge.

There are red spots on its under body and dorsum running longitudinally along the centre and at the mantle edge.

[4] This species can reach a total length of at least 50 mm and has been observed feeding on sponges from the genus Psammocinia.