This U.S. Geological Survey (USGS) data release provides a digital geospatial database for the reconnaissance geologic map of the Selway-Bitterroot Wilderness, Idaho County, Idaho, and Missoula and Ravalli counties, Montana (Toth, 1983). Attribute tables and geospatial features (points, lines, and polygons) conform to the Geologic Map Schema (USGS NCGMP, 2020) and represent the geologic map as published in the USGS Miscellaneous Field Studies Map MF-1495-B. The 1.5-million-acre map area represents the geology at a publication scale of 1:125,000. References: Toth, M.I., 1983, Reconnaissance geologic map of the Selway-Bitterroot Wilderness, Idaho County, Idaho, and Missoula and Ravalli counties, Montana: U.S. Geological Survey, Miscellaneous Field Studies Map MF-1495-B, scale 1:125,000, https://doi.org/10.3133/mf1495B. U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema) - A standard format for the digital publication of geologic maps: U.S. Geological Survey Techniques and Methods, book 11, chap. B10, 74 p., https://doi.org//10.3133/tm11B10.