The photoreduction of 1,2-diarylcyclopropanes 1 by NaOH yielded the corresponding 1,3-diarylpropanes 2 in i-PrOH. The efficiency of the photoreduction was dependent on the electron deficiency of 1 and the excitation wavelength, solvent, and additive. This is a rare example of a cyclopropane serving as an electron acceptor to afford a reduction product.