Un- and Sn-doped CdO thin films were deposited on FTO-coated glass substrates using electrodeposition method. Crystalline study revealed a cubic phase for all samples. SEM images showed flower- and rod-like morphologies for the Sn-doped samples in nano-dimensions. Optical energy band gaps of 2.70, 2.79, and 2.84 eV were obtained for Sn0, Sn1, and Sn2 samples, respectively. Electrical investigations indicted that CdO thin films revealed n-type conductivity with high density of donor levels, which exceeded by corporation of Sn cations in the crystalline structures of CdO thin films.