William Aldrich (January 19, 1820 – December 3, 1885) was an American Republican politician who served as Congressman from the state of Illinois.

Aldrich moved to Michigan and then to Two Rivers, Wisconsin, where he worked as a shopkeeper and manufacturer.

[1] He served as superintendent of schools from 1855 to 1856 and chairman of the county board of supervisors from 1857 to 1858.

[1] Aldrich died in Fond du Lac, Wisconsin.

[1] His son, James Franklin Aldrich also became a Congressman, holding the same congressional seat as his father.