The solubilities of imidacloprid in water, methanol, ethanol, acetone, 2-butanone, dichloromethane, 1,2dichloroethane, and trichloromethane were measured at temperatures from (293.15 to 353.15) K by a synthetic method at atmospheric pressure. The solubilities were correlated by the λh model, in which new parameters were introduced to express the activity coefficients of imidacloprid, determined from the experimental data. The experimental data were also correlated with the Apelblat equation.