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Optical properties of ZnS thin films coated with organic dye extract on different Zn 2+ concentrations from ZnSO 4 are presented in this study. The effects of concentration and post-deposition annealing temperatures on the optical properties of the films were investigated. Aqueous dye extract-coated ZnS nanocrystals, were prepared by a simple and low-cost chemical bath deposition method. Results obtained revealed that optical properties of the films were modified by concentration and post-deposition annealing temperature. Increasing concentration reduced the transparency of the films. Annealing increased the transparency of the films except for films deposited with 0.1M concentration of ZnSO 4 . In general, the heat-treated layers were found to transmit better than the as-deposited layers. The analysis of energy band gap showed a reduction in band gap with increasing Zn 2+ concentration of the asdeposited films. It also indicated that post-deposition annealing, increased energy band gap except for films deposited with 0.1M concentration of ZnSO 4 . The relationship between the energy band gap with both concentration and post-deposition annealing fit into the quadratic model with high R 2 values. The range of values of 3.889-3.981eV recorded for the band gaps is within the range for application in diverse solar architecture and optoelectronic devices.