Fennimore is a town in Grant County, Wisconsin, United States.

The unincorporated community of Lancaster Junction, Wisconsin is located in the town.

Fennimore was named for a settler who disappeared during the Black Hawk War.

[3] According to the United States Census Bureau, the town has a total area of 34.8 square miles (90.0 km2), all of it land.

12.6% of all households were made up of individuals, and 5.5% had someone living alone who was 65 years of age or older.