Wien is a town in Marathon County, Wisconsin, United States.

It is part of the Wausau, Wisconsin Metropolitan Statistical Area.

According to the United States Census Bureau, the town has a total area of 31.6 square miles (81.7 km2), of which 31.6 square miles (81.7 km2) is land and 0.03% is water.

At the 2000 census there were 712 people, 248 households, and 200 families living in the town.

There were 260 housing units at an average density of 8.2 per square mile (3.2/km2).