Solubility data of the solid–liquid equilibrium of 4-acetylbenzoic acid in aqueous and different organic solvents is essential for industrial design and theoretical studies. The solubility of 4-acetylbenzoic acid in water, acetic acid, p-cymene, tert-butylbenzene, and water-acetic acid (1:1vol.) mixture was measured within a temperature range of 303.15 to 473.15K. Solubility was measured by the isothermal method and the resulting data were analyzed by regression analysis. The solubility of 4-acetylbenzoic acid was the highest in acetic acid, followed by the water-acetic acid (1:1vol.) mixture, p-cymene, tert-butylbenzene, then water. The results correlated well with the modified Apelblat equation and the Buchowski–Książczak λH equation. The calculated solubilities by using modified Apelblat solubility model were in good agreement with the experimental data. The percentage of average relative deviations of the correlation is 0.27 for solubility of 4-acetylbenzoic acid in acetic acid solvent.