Halloysite is a very interesting naturally occurring aluminosilicate, which has received great attention due to its nanotube shape. We used this nanostructured material as support for hematin, a biomimetic catalyst, which was successfully employed for the aniline polymerization. The adsorption of hematin (Heme) on the halloysite nanotubes (HNTs) was confirmed by UV-vis spectroscopy, zeta potential measurements, thermal analysis and X-ray diffraction. The resulting HNTs/Heme/PANi nanocomposites were characterized by transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FUR). UV-vis and FTIR confirmed the formation of the conjugated form of polyaniline (PANi). Electrical conductivity of the HNTs/Heme/PANi nanocomposites was in the order of 8.8 x 10(-1) S/cm. This work shows the use of a naturally occurring nanostructured material as support for biomimetic catalyst immobilization, opening possibilities for a large-scale and environmentally friendly polyaniline synthesis. Published by Elsevier B.V.