Chemical evolution may refer to:

• Abiogenesis, the transition from nonliving elements to living systems

• Astrochemistry, the study of the abundance and reactions of molecules in the universe, and their interaction with radiation

• Cosmochemistry, the study of the chemical compositions in the universe and the processes that led to them

• Evolution of metal ions in biological systems, incorporation of metallic ions into living organisms and how it has changed over time

• Gas evolution reaction, the process of a gas bubbling out from a solution

• Molecular evolution, evolution at the scale of molecules

• Oxygen evolution, the process of generating molecular oxygen through chemical reaction

• Stellar nucleosynthesis, the creation of chemical elements by stellar thermonuclear fusion or supernovae