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We have used powder neutron diffraction to study the magnetic ordering and the crystallographic structure of the orthorhombically distorted perovskite BaPr03. Reitveld refinement of high-resolution neutron-powder-diffraction patterns showed that BaPr03 belongs to space group Pbnm, with a =6. 2137(3) A, b =6.1787(3) A, and c =8.7261{4)A at room temperature. Our structural determination, confirmed by high-resolution x-ray powder diffraction, corrects the erroneous reversal of the a and b lattice parameters previously reported in the literature. The Pr moment is observed to order continuously and reversibly below Tn= 11.7(2) K. The Pr spins are staggered along the c axis and the [110] direction with a low-temperature thermally averaged moment of ()M, ) =0. 35 (5)pe.

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