Chemical kinetic data for more than 250 gas phase reactions of possible importance in the atmosphere have been reviewed. The results of available evaluations of the rate data are tabulated with selected recent experimental values. A preferred value for each reaction rate constant is indicated. A brief discussion of some of the experimental techniques that have been utilized is also given. This discussion emphasizes the capabilities and limitations of the individual techniques. The tables should be of use to those interested in modeling the complex chemical processes of the stratosphere, troposphere, or the urban atmosphere.