Capture, elastic scattering, and total cross-section measurements were performed on 237Np between 8 and 204 eV. The neutron widths, Γn, were obtained for 200 resonances and the radioactive widths, Γγ, for 25 resonances. The mean capture width <Γγ> = 41.2 ± 2.9 meV, and the mean s-wave resonance spacing D0 = 0.740 ± 0.061 eV. The s-wave strength function was found to be S0 = (1.02 ± 0.14) × 10−4.