Cuthona nana is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Cuthonidae.

In 1848 the same authors described Eolis peachii from Fowey harbour, Cornwall.

[3] Cuthona nana was described from specimens found under stones near low water mark at Cullercoats and Whitley Bay on the North Sea coast of England.

[1] It is reported from the NE Atlantic from Greenland and Spitsbergen south to Brittany, France.

[4] Feeds on the hydroid Hydractinia echinata.