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A new equation of state is proposed to correlate the osmotic pressure data for aqueous lysozyme solutions with (NH4)2SO4, (NH4)2C2O4 and (NH4)2HPO4 at ionic strengths of 13.5 mol/kg and pH 4, 7 or 8 with only one adjustable parameter instead of the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The Carnahan-Starling equation represents the contribution of the hard sphere repulsion to the osmotic pressure. The attractive dispersion interaction is represented by the Lennard-Jones potential expressed by the equation of Cotterman et al. based on perturbation theory. The double-layer repulsion interaction is represented by Yukawa potential expressed by the equation of state of Duh and Mier-Y-Teran based on mean spherical approximation. The total average relative deviation of the correlation of the osmotic pressure data is 1.68%.