Cyclam has been N-functionalized and linked to the nitrogen of pyrrole through an alkyl spacer. After complexation of the ligand by nickel(II) or cobalt(II), the complexes have been electropolymerized on the surface of electrodes, by cyclic voltammetry or at constant potential. The Ni(III)/Ni(II) redox system is very distinctly visible on the voltammogram of the poly[Ni(II)-cyclam-N-(CH 2 ) 5 -pyrrole] film, even after over-oxidation of the polypyrrole backbone; from this observation it is obvious that the electron transfer between nickel sites occurs through hopping. The electropolymerization of Co(III)-cyclam-N-(CH 2 ) 5 -pyrrole is more difficult and the films are thin and brittle; those obtained from the electropolymerization of the Co(II) complex are of a better quality. The Co modified glassy carbon electrodes are active for the electrocatalytic reduction of dioxygen in acidic media. A gold electrode modified by poly[Co(III)-cyclam-N-(CH 2 ) 5 -pyrrole] catalyses the nitrate ion reduction at -1.0 V versus saturated calomel electrode (SCE) in a strongly basic medium, after amalgamation.