Stable, aqueous dispersions of polypyrrole latex particles were prepared by a dispersion polymerization technique using ferric chloride as the initiator and partially hydrolyzed poly(vinyl acetate) as the stabilizer. Monodisperse particles in the approximate size range from 100 to 150 nm diameter were obtained. At the optimum PVA:pyrrole mass ratio (corresponding to the “knee” in the PVA adsorption isotherm on polypyrrole particles), the electrical conductivity of the particles is ∼5 Ω −1 cm −1 .