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

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

The unincorporated community of Moon is located partially in the town.

There were 244 housing units at an average density of 9.0 per square mile (3.5/km2).

The racial makeup of the town was 99.19% White, 0.16% Native American, and 0.65% from two or more races.