Cuthona is a genus of nudibranch in the family [[ Cuthonidae]].

[1] Cuthona species feed on hydroids, and have uniseriate radulae with polydentate radular teeth.

Some authorities consider the genera Catriona and Trinchesia to be synonymous with Cuthona.

Most Cuthona species were transferred to other genera as a result of DNA phylogeny studies in 2016 and 2017.

[3][4] Species in the genus Cuthona include:[1]