Mercer is a town in southern Iron County, Wisconsin, United States. The population was 1,732 at the 2000 census. The census-designated place of Mercer and the unincorporated communities of Carter and Manitowish are located within the town.
Mercer identifies itself as the "Loon Capital of the World" to promote tourism. A wildlife study found Mercer had the highest concentration of common loons in the world. In front of the Mercer Chamber of Commerce's information center, there is a 16-foot (4.9 m), 2,000-pound (910 kg) statue named "Claire de Loon". Mercer also hosts an annual "Loon Day" festival, which features an arts and crafts fair, live music and a loon calling contest.