Cyclohexanone is a cyclic ketone that consists of cyclohexane bearing a single oxo substituent. It has a role as a human xenobiotic metabolite.

Cyclohexanone (also known as oxocyclohexane, pimelic ketone, ketohexamethylene, cyclohexyl ketone or ketocyclohexane) is a six-carbon cyclic molecule with a ketone functional group. It is a colorless, oily liquid with an acetone-like smell.