Doped polyindole can be obtained either after anodic oxidation of indole, C8NH7, in various electrolytic solutions or after indole chemical oxidation in acetonitrile - oxidizing agent (FeCl3, CuCl2, KIO3) solutions. This conducting polymer exhibits a good air stability with room temperature electrical conductivities, in the range 10(-3) to 10(-1) S.cm-1, depending on the nature of the counterion and on the polymerization process. The influence of the experimental synthesis conditions on the morphology of the chemically obtained polyindole is examined.