Kings Mills is a census-designated place in the northeastern corner of Deerfield Township of Warren County, Ohio, United States, on the western shore of the Little Miami River.

Another town, Gainsboro, was platted on the site of present-day Kings Mills in 1815, but it did not prosper.

[4] Kings Mills was formerly the home of the College Football Hall of Fame, which moved to South Bend, Indiana in 1995.

The community is in the Mason (513) telephone exchange and is served by the Kings Mills/Kings Island post office (45034).

Kings Island amusement park and Great Wolf Lodge indoor water park are immediately south of the community in Mason.