Highly ordered prussian blue (PB) nanowire arrays were fabricated successfully for the first time by self-assembling in a nanoporous anodic aluminum oxide template. The nanowires with different lengths and diameters could be obtained by controlling, respectively, the deposition time and the size of the nanohole in the template. The structure and morphology of the nanowires were characterized by X-ray diffraction, transmission electron microscopy, and selected area electron diffraction. The results showed each of the nanowires was a continuous and preferentially of single crystal with face-centered-cubic structure. The Curie temperature T-c of PB nanowires was lower with respect to that of PB bulk. The growth mechanism of the nanowire is also discussed. (C) 2004 The Electrochemical Society.