This article presents a compilation of critically evaluated kinetic data for elementary homogeneous gas-phase chemical reactions, primarily focused on combustion processes. The data sheets cover approximately 196 reactions, providing relevant thermodynamic data, rate coefficient measurements, reliability assessments, references, and recommended rate parameters. The reactions are mainly related to the combustion of methane and ethane in air, with some reactions involving exhaust gases and aromatic compounds. The data sheets follow a standardized format, including sections on rate coefficient measurements, reviews and evaluations, and comments on experimental details. The preferred rate constants are presented as temperature-dependent expressions, with error limits and reliability assessments. The compilation aims to support computer modeling of combustion processes and is part of the "Kinetics and Mechanisms of Chemical Processes in Combustion" project within the European Community Energy Research and Development Programme.This article presents a compilation of critically evaluated kinetic data for elementary homogeneous gas-phase chemical reactions, primarily focused on combustion processes. The data sheets cover approximately 196 reactions, providing relevant thermodynamic data, rate coefficient measurements, reliability assessments, references, and recommended rate parameters. The reactions are mainly related to the combustion of methane and ethane in air, with some reactions involving exhaust gases and aromatic compounds. The data sheets follow a standardized format, including sections on rate coefficient measurements, reviews and evaluations, and comments on experimental details. The preferred rate constants are presented as temperature-dependent expressions, with error limits and reliability assessments. The compilation aims to support computer modeling of combustion processes and is part of the "Kinetics and Mechanisms of Chemical Processes in Combustion" project within the European Community Energy Research and Development Programme.