Oxidation kinetics of a Turkish oil shale (Bolu-Himmetoglu), when subjected to an air flow of 1.5 L/min at different pressures, was studied. CO, CO2 and O2 gas concentrations were measured as a function of controlled increasing temperature. The reaction rate equation obtained at the end of the kinetics study showed that oxidation of oil shale is dependent upon oxygen partial pressure and organic matter content, and that the relation between reaction rate constant and temperature fits an Arrhenius type of equation. The oxidation reaction was determined to occur in three stages; low temperature, transition and high temperature zones. The rate controlling mechanism was observed to be chemical kinetics in the first region, while diffusion was rate controlling in the last stage of the reaction.