The kinetics of non-catalytic as well as catalytic oxidation of isobutyraldehyde has been investigated. Reaction rate equations for the formation of the main product isobutyric acid and of the side products acetone, CO and CO, were derived. Kinetic parameters, namely the order of reaction, preexponential factor and activation energy were estimated by non-linear regression. The influence on selectivity and activity of the different types of catalysts employed was investigated quantitatively.