Cromwell is an unincorporated community in Ohio County, Kentucky, United States.

Secondary students in Cromwell attend Ohio County Middle and High Schools, located in the Hartford/Beaver Dam area.

Interstate 165 (formerly the William H. Natcher Parkway) provides direct access to Cromwell via the Exit 33 interchange with U.S. 231 just south of the Ohio-Butler County line.

The community is also directly served by the Western Kentucky Parkway at its Exit 75 interchange on the southern edge of Beaver Dam.

Cromwell is home to a Perdue Farms poultry and pork processing plant.