Calamus is a town in Dodge County, Wisconsin, United States.

The unincorporated community of South Beaver Dam is located in the town.

The unincorporated community of Lost Lake is also located partially in the town.

There were 396 housing units at an average density of 11.0 per square mile (4.2/km2).

14.8% of all households were made up of individuals, and 4.2% had someone living alone who was 65 years of age or older.