Radcliff is a city in Hardin County, Kentucky, in the United States. The population was around 23,042 as of the 2020 Census, up from 21,692 from the 2010 census.
Its economy is largely dominated by the adjacent U.S. Army base Fort Knox and by the nearby city of Elizabethtown. Radcliff's population previously fluctuated greatly depending on the deployments of the units at the base, but the BRAC reorganization of 2005, and the quartering of the U.S. Army's Human Resources Command to Fort Knox has created a larger and more stable population. Radcliff is a home-rule class city under Kentucky law.