Abstract. The Kinetics and mechanism of Ruthenium(III) catalyzed oxidation of cyclohexanone by  an alkaline solution of potassium bromate (KBrO₃ ) has been carried out  in the temperature  range 300 – 450 ºC.  Mercuric acetate is used in the reaction mixture as a scavenger for Br– ion to prevent parallel oxidation by bromine. The reaction follows identical kinetics. The reaction exhibits first order kinetics with respect to substrate cyclohexanone and catalyst Ru(III) while zero order kinetics with respect to oxidant KBrO₃. The rate increases with increasing concentration of Cl ^– and OH^-    showing positive effect on the rate of reaction. Negligible effect of mercuric acetate and ionic strength of the medium was observed. Ruthenium(III) chloride has been reported to give a number of possible chloro species depending on the pH of solution. The reactive species of Ru(III) in alkaline medium is [RuCl₃(H₂O)(OH)^-] under the experimental pH range. A suitable mechanism in conformity with the kinetic observation has been proposed. The various activation parameters such as energy of activation (DE*), Arrhenius factor (A), entropy of activation (DS*) were calculated from the rate measurements at 300, 350, 400, and 450 C. A rate law has been derived on the basis of obtained data.