Jerome Increase Case (December 11, 1819 – December 22, 1891) was an early American manufacturer of threshing machines. He founded the J. I. Case Company which has gone through many mergers and name changes to today's Case Corporation. He served three terms as mayor of Racine, Wisconsin, and represented Racine County in the Wisconsin State Senate in 1865 and 1866. He also raised champion race horses.