The electroreduction of CH2Cl2 at Ni, Cu, Pt and Ag electrodes in acetonitrile and (C4H9)(4)NI 0.1 M as supporting electrolyte was studied. The half-wave potential was found to be in the range -2.2 to -2.5 V vs SCE at room temperature. From the analysis of the gaseous products it was found that methane, ethylene, chloromethane, propene and butene isomers were the main products, while at silver and platinum cathodes methane was mainly produced. The effect of the potential on the current efficiency of the gaseous products was also studied. The current efficiency of the products increases at concentration levels of CH2Cl2 up to 0.2 M, whereas at higher values its CE is not significantly influenced. The application of the Schultz-Flory distribution analysis to the experimental data showed that the hydrocarbons are mainly formed via polymerization of methylene radicals on the surface of Ni and Cu electrodes. At Ag and Pt electrodes the mechanism appears to be different.