Pr5Si3 single crystals have been grown by the floating zone technique with optical heating. The crystals are crack-free, 6 mm in diameter and 40-60 mm in length. Pr5Si3 crystallizes with the tetragonal Cr5B3 crystal structure type (space group: I4/mcm) and with lattice parameters a = b = 7.8172(7) and c = 13.816(3). Single crystal XRD data have been refined based on the Cr5B3 structure. The electrical resistivity of Pr5Si3 single crystals exhibit metallic behavior with an anomaly at T-C = 43.5(1.0) K corresponding to a ferromagnetic ordering transition, which was confirmed by magnetic susceptibility measurements. (C) 2004 Elsevier B.V. All rights reserved.