The fluoride removal ability of widely available i.e. inexpensive agricultural waste (rice husk ash) especially West Bengal from ground water was studied at different concentrations, contact times, reaction temperatures, adsorbent dosage, coexisting anions and pH of the solution. The rate constants of adsorption, intraparticle transport have been calculated at 303K. The empirical model has been tested at various concentrations for the present system. The removal of fluoride is favourable at low concentration (5 mgL-1), high temperature (313K) and under highly acidic conditions. The batch adsorption process fitted well the Langmuir isotherm and the adsorption kinetics followed the pseudo-second-order rate equation.