Elizabethtown is a census-designated place (CDP) in Whitewater Township, Hamilton County, Ohio, United States. The population was 350 at the 2010 census.
Elizabethtown is located at 39°9′30″N 84°48′16″W / 39.15833°N 84.80444°W, in the valley of the Great Miami River, 20 miles (32 km) west of downtown Cincinnati. U.S. Route 50 runs through the center of the community, and Interstate 275 passes it to the northwest but does not provide direct access to it.
According to the United States Census Bureau, the CDP has a total area of 0.89 square miles (2.3 km2), all of it land.