John Montgomery Smith (February 26, 1834 – May 14, 1903) was an American lawyer, Democratic politician, and Wisconsin pioneer. He was a member of the Wisconsin State Assembly, representing Iowa County in the 1893 session, and served four terms as mayor of Mineral Point, Wisconsin. His father, William Rudolph Smith, was the 5th Attorney General of Wisconsin. In contemporaneous documents, his name was usually abbreviated as J. M. Smith.