A differential pulse polarographic study of the complexation of cadmium(II) with imidazole gives the relationship, Ej/2= -0.798 – 0.132 log [imidazole]tfor the cadmium(II) half wave potential (E]/2) with imidazole concentration. Also, the differences between the half-wave potentials (ΔEj/2) of the complex and metal ion have been used to determine log gn(6.75) and coordination number (4) for the cadmium-imidazole complex according to Subrahmanya's method.