Millville is a village in Butler County, Ohio, United States.

Millville is part of Greater Cincinnati, just west of Hamilton, Ohio.

The village was established in 1815 by Joseph Van Horn, who opened a grist mill there about 1805.

Major League Baseball's first commissioner, Kenesaw Mountain Landis, was born in Millville.

According to the United States Census Bureau, the village has a total area of 0.58 square miles (1.50 km2), all land.

23.0% of all households were made up of individuals, and 10.7% had someone living alone who was 65 years of age or older.

The athletic teams at Ross are known as the Rams and compete in the Southwest Ohio Conference (SWOC).