Dendronotus robustus is a species of sea slug, a dendronotid nudibranch, a shell-less marine gastropod mollusc in the family Dendronotidae.

[2] This species was described from Whale Cove, Grand Menan, 44°46′26″N 66°45′38″W / 44.773778°N 66.760537°W / 44.773778; -66.760537 on the Atlantic Ocean coast of North America.

[3] Dendronotus robustus is a large dendronotid nudibranch, growing to at least 150 mm in length.

There are opaque white spots on the sides and back of the body, velar processes and rhinophore sheaths.

The body shape is similar to Dendronotus albopunctatus, with a broad foot.