This research outlines the effect of Zn doping, (Zn+Li), (Zn+Na) and (Zn+K) doubly doping of nanostructured CdO films on the structural, morphological and optical properties of the films. Un-doped, Zn-doped, (Zn+Li), (Zn+Na) and (Zn+K) double doped CdO films were synthesized on soda lime glass substrates by the SILAR method. Manufactured CdO films attached well to the glass substrates, exhibited nano-sized structures, and the physical properties of the nanoparticles were modified by co-doping. The XRD analysis confirmed that all the films exhibited face-centered cubic structure with (111) and (200) preferential growth. Calculated crystallite size values of the CdO films via the Scherrer equation decreased with Zn doping and double-doping. Optical measurements revealed that doping modifies the band gap enabling the potential of these films to be utilized in optoelectronic applications.