3-Methylcyclohexene an organic compound consisting of cyclohexene with a methyl group substituent adjacent to the alkene group.

Two other structural isomers are known: 1-methylcyclohexene and 4-methylcyclohexene.

All are colorless volatile liquids classified as a cyclic olefins.

They are specialized reagents.

3-Methylcyclohexene is produced from 3-methylcyclohexanone.