Dorchester is a village in Clark and Marathon counties in the U.S. state of Wisconsin, along the 45th parallel. It is part of the Wausau, Wisconsin Metropolitan Statistical Area. The population was 827 at the 2000 census.
Dorchester is located at 45°0′8″N 90°19′55″W / 45.00222°N 90.33194°W / 45.00222; -90.33194 (45.002233, -90.331995).
According to the United States Census Bureau, the village has a total area of 1.3 square miles (3.4 km²), of which, 1.3 square miles (3.4 km²) of it is land and 0.04 square miles (0.1 km²) of it (1.50%) is water. Most of the village lies in Clark County, with only a small portion in Marathon County.