The work presentes the development of a methodology for zoning fire risk to river watershed Ribeirão Faxinal stream, located in the municipality of Lençóis Paulista/SP. The Geographical Information System was used for the preparation the risk maps of the land-use/occupation, road system, terrain slope, terrain orientation and hydrography. Each factor was weighted separately and, subsequently, factor weights were defined, as defined by Saaty (1977). Finally, the generated maps of each factor were integrated in a single map showing the fire risk areas of the watershed. The results indicated the risk of fire "Very Low" 0.58%, "Low" 14.39%, "Medium" 45.12%, "High" 9.60% and "Very High" 30.31% of the total Of the basin area. The "Very High" and "Medium" risk classes deserve greater attention, when added up, since they represent more than half the area of the watershed and for such classes it is necessary a planning and other preventive practices to fire fighting, to guarantee efficiency in the management of the area.