An incubation experiment on potassium fixation in some mineralogically different rice soils of West Bengal was studied at varying levels of added K. About 6.2 to 42 % of added K was fixed in these soils. Potassium fixation increased with increasing amounts of applied K, however, the percentage of added K fixed decreased gradually. Addition of 15 to 240 mg K kg^-1 soil, illite and smectite dominant Inceptisols with high available and reserve K resutted in a relatively lower K fixation (4.9 to 39.6 mg kg^-1 soil) as compared to illite , smectite and chlorite dominant Entisols (5.5 to 41.0 mg kg^-1 soil) containing moderate available and reserve K. Conversely, kaolinite dominant Alfisol with low available and reserve K registered the lowest amount of K fixation (2.5 to 14.9 mg kg^-1 soil).