Chemical Laboratories, Feroze Gandhi College, Raebareli-229 001. Uttar Pradesh,- India E-mail : she_ila72@yahoo.com Manuscript received 28 June 2005, revised 20 October 2005, accepted 1December 2005 Kinetic investigations in ruthenium(III) catalyzed oxidation of maltose in an alkaline solution of KBrO3 have been carried out in the temperature range of 30-45 °C. Mercuric acetate is used in the reaction mixture as a scavenger for Br - ion to prevent parallel oxidation by bromine. The reaction exhibits first order kinetics. The order of reaction with respect to substrate and catalyst is zero and one respectively. The rate decreases with increasing concentrations of Cl- and Oir respectively exhibiting negligible elfert of mercuric acetate, ionic strength and D2O. A suitable mechanism in conformity with the kinetic observations has been proposed. The various thermodynamic parameters were calculated from the rate measurements at 30, 35, 40 and 45 °C respectively.