This study was to investigate sorption behavior of selected antibiotics in soils. The pH effect on sorption was also studied. Results showed organic matter was an important factor in the sorption of sulfamethoxazole and sulfapyridine to soil, while trimethoprim could be easily sorbed on different types of soils, and displayed a higher sorption potential than sulfamethoxazole and sulfapyridine. The extent of sulfamethoxazole sorption on selected soils was highest at low pH and decreased with increasing pH. An increase in pH was found to have no significant affect on the sorption of sulfapyradine, while sorption was found to have increased initially and decreased beyond a certain pH value for trimethoprim.