The 237Np-to-235U fission cross-section ratio was measured at 66 discrete energies between 0.1 and 9.4 MeV using the 7Li(p, n)7Be and D(d, n)3He reactions as neutron sources. The sample masses were determined by low geometry alpha-particle counting. The specific activities of the uranium samples are based on (a) isotopic analyses and published half-lives, (b) colorimetric analyses, and (c) isotopic dilution analyses. The neptunium specific activity depends on the half-life measurement of Brauer et al.