The electrochemical behaviour of some azo compounds of 4-aminoanti-pyrine derivatives (I-V) have been studied in ethanolic buffered solutions using tost polarography (DC sampled mode), linear sweep and cyclic voltam-mograms. Generally, the reduction polarograms of these compounds show a single, 4-electrons diffusion controlled irreversible wave within the entire pH range (2–12), which represents the reduction process. The kinetic parameters of the elctrode reaction are given.