The solubility of potassium iodide in ethanol + water binary solvent was measured over the entire composition range from 0 to 1 weight fraction of ethanol at (298.15, 303.15, 308.15, and 313.15) K. The densities of the saturated solutions are also reported. Equations are given for the solubility and density of the saturated solutions as functions of mole fraction of ethanol and temperature.