Ango is the main species of fruit in the state of Campeche, Mexico, due to the economic benefts generated because of its production and marketing. Among the biotic problems that afect this crop in the region are weeds, which involve a heavy economic investment for their management. Under this scenario, it is important the development of ecological weed studies to generate information that help us to design strategies for managing the problem. During January to June 2010 a foristic study was developed on the population of weeds that compete with mango in the locations of Cayal and Castamay, at the state of Campeche. We obtained information from 20 mango orchards using 0.50 × 0.50 m quadrats, with a total of 20 quadrants/ha. Within each quadrat, we counted the number of weed species and determined relative density, relative dominance, frequency and spatial distribution. Te results showed the presence of 28 weed species in both locations. Te most abundant and dominant species was Rottboellia cochinchinensis Lour., while the most common species was Desmodium canadense L. Te dominant spatial distribution was aggregate in most species in the two study locations.