[en] The interaction of 1 eV to 20 MeV neutrons with ²³⁸U is discussed with emphasis on recently resolved and remaining issues relevant to both application need and physical understanding. The apparent inability of older ²³⁸U evaluations to predict the measured ²³⁸U capture rate in thermal critical lattices has stimulated several recent precise measurements of the ²³⁸U cross sections, reanalysis of older data, and improved evaluations. The recent evaluations predict satisfactorily the ²³⁸U capture rate in thermal critical lattices. In the region from 1.5 to 4 keV there are differences of the order of 15%, sometimes larger, between the values of the neutron widths of the main resonances reported by several experimenters or obtained by different evaluators. Above 4 keV there are only sparse results of resonance analysis and most evaluations adopt a statistical treatment of the resonance structure. Some factors affecting the determination of the average properties of the resonance parameters are discussed. Above the inelastic-scattering threshold, energy-averaged neutron total, scattering, capture and fission cross sections are reviewed in a unified manner integrating measurement, calculation and evaluation. (n;n') and (n;2n') energy-transfer mechanisms are addressed. Particular attention is given to neutron capture, stressing precisions consistent with applied need. Fission properties are discussed including: prompt and delayed fission-neutron spectra and nubar, and fission-product yields. Physical understanding is assayed, with attention to compound-nucleus and direct-reaction mechanisms, and applications impact is illustrated in the context of fast-breeder-reactor performance. 95 references