Greenfield is a town in La Crosse County, Wisconsin, United States.

According to the United States Census Bureau, the town has a total area of 30.1 square miles (77.9 km2), all of it land.

There were 570 housing units at an average density of 18.9 per square mile (7.3/km2).

15.3% of all households were made up of individuals, and 4.2% had someone living alone who was 65 years of age or older.

The Franciscan Sisters of Perpetual Adoration have their retirement home in St. Joseph.