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

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

At the 2000 census there were 847 people, 271 households, and 223 families living in the town.

There were 286 housing units at an average density of 8.7 per square mile (3.3/km2).

The racial makeup of the town was 97.40% White, 0.12% African American, 1.77% Asian, and 0.71% from two or more races.