Several aromatic and aliphatic α,β-unsaturated ketones were converted to the corresponding γ-keto acids by the electrochemical reduction in acetonitrile in the presence of CO2. The yields of the keto acid were 73–82% when the enones have at least one aromatic substituent. In the case of aliphatic enones, the yields of the carboxylation reaction were 67% for 2-cyclohexen-1-one and 44% for 3-buten-2-one.