The characteristics of the electrochemical reduction of copper oxide have been studied using linear potential sweep voltammetry. Copper(II) and copper(I) oxides, formed on copper electrodes during triangular potential cycling, reduced at potentials close to the reversible values for the CuO−Cu2O and Cu2O−Cu couples, respectively. The reduction of bulk Cu2O and CuO deposited on carbon paste, glassy carbon and copper electrode surfaces required significant overpotentials. Both oxide species could be distinguished from the potentials of their cathodic reduction peaks. In each system studied, CuO was reduced before Cu2O. We discuss the implications of these findings on the Pops and Hennessy galvanostic method for determining oxides formed on copper in the wire industry.