The Conference Proceedings will be published with an ISSN and ISBN, indexed in Google Scholar, and archived permanently in Portico. The 6th International Conference on Combustion Science and Processes (CSP 2021) aims to become the leading annual conference in fields related to combustion science and processes. The goal of CSP 2021 is to gather scholars from all over the world to present advances in the relevant fields and to foster an environment conducive to exchanging ideas and information. This conference will also provide an ideal environment to develop new collaborations and meet experts on the fundamentals, applications, and products of the mentioned fields. CSP 2021 is an acronym for Combustion Science and Processes. Topics for CSP’2021 include, but are not limited, to the following: Combustion and Pollution Engine Design Experimental Measurements Fuels Gas Turbine Combustion Heterogeneous Combustion Combustion Reaction Kinetics New Combustion Processes and Devices Numerical Simulation