  The Keck Wide-Field Imager (KWFI) is a proposed 1-degree diameter field of
view UV-sensitive optical camera for Keck prime focus. KWFI will be the most
powerful optical wide-field camera in the world and the only such 8m-class
camera sensitive down to ~3000 A for the foreseeable future. Twenty science
cases are described for KWFI compiled largely during 2019-2021, preceded by a
brief discussion of the instrument, components, and capabilities for context.
