The DOE 2020 Occupational Radiation Exposure Report analyzes occupational radiation exposures at U.S. Department of Energy (DOE) facilities during calendar year 2020. This report includes occupational radiation exposure information for all DOE employees, contractors, subcontractors, and visitors, including the National Nuclear Security Administration. The 96 DOE organizations submitting radiation exposure reports for 2020 have been grouped into 35 sites. This information has been analyzed and trends over time are presented to provide a measure of DOE’s performance in protecting its workers from radiation.