Greenfield is a village in Highland, Fayette, and Ross counties in the U.S. state of Ohio, along Paint Creek. The population was 4,906 at the 2000 census. Although the municipality is listed as a city by the Census Bureau, it officially became a village when its population dropped below 5,000.
Greenfield is located at 39°21′6″N 83°23′11″W / 39.35167°N 83.38639°W / 39.35167; -83.38639 (39.351623, -83.386461), almost entirely in Highland County.
According to the United States Census Bureau, the village has a total area of 1.9 square miles (5.0 km²), all of it land.