Hydroxyapatite (Ca-10(PO4)(6)(OH)(2))-imidazole-polyethylene oxide (HAp-Im-PEO) composite films were prepared by casting the HAp-dispersed acetonitrile solution containing Im and PEO and their conducting behavior was investigated. The conductivity of the composite film (HAp-Im-PEO (1: x: 5, by weight)) was 0.214 mS cm(-1) (x = 2) and 0.695 mS cm(-1) (x = 5) at 80 degrees C. The increase in the amount of Im enhanced the conductivity of the composite films. Infrared spectra of the composite films suggest that the charge carriers in them are imidazolium ions that are produced by acid-base reaction between imidazole and the phosphate groups on the surface of HAp. (C) 2005 The Electrochemical Society.