The solubilities of thiourea in ethanol or methanol + water from (289.75 to 330.85) K and the enthalpies of solution of thiourea in methanol, ethanol, or water had been determined with the suitable experimental methods and apparatus. The experimental data of solubilities were correlated with the modified Apelblat equation. The solubilities correlated by the model show good agreement with experimental data. The enthalpies of solution for thiourea in methanol, ethanol, or water were also determined. It was concluded that the solvent proton-donor ability and existing steric hindrances for hydrogen bonding and other intermolecular interactions play a decisive role in the solvation of thiourea.