A novel CO2laser using electrochemical transformation of organic compounds (ECTO) has been developed. cw CO2laser action was obtained by applying an electric discharge to the air, which contained organic vapors such as alcohols and benzene derivatives. The CO2molecules produced by the chemical reaction in the laser tube and the N2molecules contained in the air were excited by the discharge. The ECTO CO2laser produced an output power of 7 W, which was comparable to the power obtained from a conventional CO2laser gas mixture.