The cyclic voltammogram of endosulphan recorded in various supporting electrolytes in aqueous methanolic medium at hanging mercury drop electrode, revealed a single cathodic peak at -1.25 V versus Ag/AgCl. The electrochemical behaviour of endosulphan after nitration at micro level has been studied at glassy carbon electrode. The nitro derivative also revealed a sharp cathodic signal at -0.9 V versus Ag/AgCl. The electrode reaction is found to be irreversible and diffusion controlled. Cathodic peak appeared to be analytically useful.