Beaverdam is a village in Allen County, Ohio, United States. Its population was 356 as of the 2000 census. It is included in the Lima, Ohio Metropolitan Statistical Area.
Beaverdam is located at 40°49′57″N 83°58′24″W / 40.8325°N 83.97333°W / 40.8325; -83.97333 (40.832363, -83.973430).
According to the United States Census Bureau, the village has a total area of 0.6 square miles (1.6 km²), all of it land.