Clethodim is an herbicide of the cyclohexanedione family. It is used to control grasses, especially annual ryegrass (Lolium rigidum). Although impure samples appear yellowish, the compound is colorless.

Clethodim's HRAC classification is Group A (Australia and global) or Group 1 (numeric). Group A herbicides inhibit acetyl-CoA carboxylase (ACCase).