This report presents a grain, oilseeds, and livestock model of Japan (JPGOL). It describes the background, product coverage, and model structure of JPGOL. A computer-generated listing of the model is provided. The model includes equations for food demand, feed demand, crop and livestock supplies, stocks, trade, and supply and demand prices. The model takes into account cross-commodity effects on both the demand and supply sides of Japan's grain, oilseeds, and livestock complex. The report also discusses the policy analysis ca abilities of the model and presents some results of model simulation.