Woodruff is a town in Oneida County, Wisconsin, United States. The population was 1,982 at the 2000 census. The census-designated place of Woodruff is located in the town.
Woodruff is home to the world largest penny (affectionately known to local residents as "The Big Penny"). The penny is made of concrete, weighing 17,452 pounds.
According to the United States Census Bureau, the town has a total area of 35.6 square miles (92.1 km²), of which, 28.5 square miles (73.9 km²) of it is land and 7.0 square miles (18.2 km²) of it (19.79%) is water.