We describe for the first time the preparation of colloidal dispersions of surfactant-stabilized polypyrrole particles in aqueous media using an anionic surfactant, sodium dodecylbenzenesulfonate. This novel colloidal form of polypyrrole has been characterized by various techniques including electron microscopy, photon correlation spectroscopy, FTIR spectroscopy, elemental microanalyses, and conductivity measurements.