Copper and manganese doped zinc sulfide (ZnS-Cu and ZnS:Mn) thin films are deposited on glass substrates using chemical bath deposition (CBD) method, with the both copper and manganese concentration varying from 0.5 to 4 mol%. All films were annealed in the temperature range of 100-500 degrees C and characterized by X-ray diffraction (XRD) and optical absorption. All samples are shown to be crystallized in the hexagonal phase of ZnS with a preferential orientation in the (008) direction. The XRD analysis showed that after annealing process, ZnS:Cu and ZnS:Mn films can be converted to ZnO:Cu and ZnO:Mn films at annealing temperature of 300 degrees C. The electrical conductivity measurments were taken in the dark before and after annealing temperature of 400 degrees C for 1 h. The electrical conductivity of ZnS:Cu films decreased after annealing process. However, it increased for ZnS:Mn thin films. The activation energy values were obtained using the temperature-dependent current measurements in the range of 300-623 K.