Martinsville is a village in Clinton County, Ohio, United States.

[6] Martinsville lies along State Route 28 west of New Vienna and east of Midland.

According to the United States Census Bureau, the village has a total area of 0.44 square miles (1.14 km2), all land.

The racial makeup of the village was 96.1% White, 1.3% African American, 0.2% Asian, and 2.4% from other races.

15.4% of all households were made up of individuals, and 6.7% had someone living alone who was 65 years of age or older.

There were 169 housing units at an average density of 382.7 per square mile (147.8/km2).

17.5% of all households were made up of individuals, and 9.4% had someone living alone who was 65 years of age or older.