John B. Kupfer (March 10, 1833 – September 9, 1897) was an American politician and businessman from Kenosha, Wisconsin who served as Mayor of Kenosha.

[2][3] As mayor, John oversaw the construction of Kenosha’s sewer system, grading of streets, and organizing of a formal police force.

He also oversaw the construction of Kenosha's high school and fire house.

In addition to serving as mayor, Kufper served a five-year term as county supervisor of Kenosha County, Wisconsin.

[4] John Kupfer's son, William Kupfer, married Philomena Pirsch, sister of fire apparatus inventor Peter Pirsch.