Contamination of soil within the vicinity of dumpsites by toxic and persistent organic pollutants is of environmental concern because of their carcinogenic, genotoxic and environmental persistence. Waste disposal sites have been identified as potential source of PAHs accumulating in soil. Assessment of level, distribution and sources of PAHs in environmental media is important for evaluation of ecotoxicological and health effect. This study investigated the distribution, sources and level of PAHs in soil within the vicinity of Balogun-Birro Dumpsite in Osogbo, Nigeria and their potential impacts on human health. Soil samples were collected at ten points within the vicinity of the dumpsite. The level of the 16 USEPA PAHs in the soil samples were determined by gas chromatography – flame ionization detector (GC-FID). The total concentration of the 16PAHs ranged between 0.1137mg/kg to 5.6491mg/kg. Samples from the main dumpsite and the mechanic workshops had highest PAHs concentrations of 5.6491mg/kg and 3.6529mg/kg respectively. The distribution of PAHs ring size is in the order of 3˃4˃5˃6˃2. Carcinogenic fractions represent 34.74% of the total PAHs. The total concentration of carcinogenic PAHs ranged from 0.06425mg/kg to 1.6775mg/kg. Diagnostic ratios of PAHs indicate that pyrogenic activities are major sources of PAHs. The study had revealed increasing accumulation of carcinogenic PAHs in soil within the vicinity of the dumpsite.