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The use of hydrologic modeling and simulation in range management has been increasing. Models provide effective and efficient tools for range management and research. As management tools, they are used to make long-term predictions and to determine the responses of rangelands to management practices. As research tools, they are used to conceptualize, organize and synthesize the available information; they are also used to focus research. Several models of rangeland hydrologic processes have been used, especially for runoff, evapotranspiration and erosion. This paper reviews and summarizes the performance of these models. The paper also discusses the problems involved with some of the techniques used to model the hydrologic processes. Recommendations for improving runoff prediction are included.