The Everglades Agricultural Area (EAA), downstream and south of Lake Okeechobee in south Florida and once part of the vast Everglades, has been drained in the early 20th century for agriculture and flood protection. As a result, the organic soils in the area are becoming shallower with pH increasing due to organic matter oxidation and mixing with limestone bedrock. Our objective was to determine the phosphorus adsorption capacity of the organic soils in the EAA and determine if P adsorption is increased in shallower soils due to increased pH. We sampled three soil series, based on their depth to bedrock varying from less than 51 cm to less than 130 cm. Adsorption isotherms experiments were conducted and the isotherms fitted to Langmuir to determine P adsorption maxima. The adsorption maxima was measured using both field moist and air-dried soil samples. Iron oxide, Aluminum oxide and calcium carbonate content were determined along with bulk density, soil organic matter content and soil pH. Soil organic matter content ranged from 71% to 87% of the soil. There was an increase in pH as soils became shallower. The adsorption maxima ranged from 429 mg Kg-1 to 6767 mg Kg-1 when moist soil samples were used and it was significantly greater than air-dried soil samples. We found that the P adsorption capacity of these soils varied among the three soil series, but could not be correlated with soil depth alone. The P adsorption capacities were lower than mineral soils and were correlated significantly to level of inorganic P in the soil, soil organic matter, pH and oxalate extractable Fe and Al in the surface 20 cm of the soil.