We present here a correlation for the estimation of solubilities of nonpolar solutes in molten polyisobutylene. Experimental solubility data from the literature are well described by the proposed equation ln(1/K-p) = A + B/T-r, where K-p is the Henry’s law solubility constant and T-r is the reduced temperature (= T/T-c). The two correlation parameters A and B are generalized by a polynomial expansion of the acentric factor omega and the parachor [P] of the solutes. A total of 115 experimental data points, covering 18 nonpolar substances, is used to determine the proposed correlation. The mean absolute percentage error between experimental and predicted values is 4.4%. This is 2.5% lower than that achieved through use of the presently available generalized method.