| Leopold Hammel | |
| Office: | District Attorney of Milwaukee County |
| Term Start: | January 2, 1893 |
| Term End: | January 7, 1895 |
| Predecessor: | Clarence S. Brown |
| Successor: | Alvin C. Brazee |
| State1: | Wisconsin |
| State Assembly1: | Wisconsin |
| District1: | Outagamie 1st |
| Term Start1: | January 5, 1885 |
| Term End1: | January 7, 1889 |
| Predecessor1: | James Campion |
| Successor1: | Louis L. Jabas |
| Party: | Democratic |
| Birth Date: | 24 August 1858 |
| Birth Place: | Rochester, New York, U.S. |
| Death Place: | Mount Sinai Hospital, |
| Death Cause: | Heart attack |
| Restingplace: | Greenwood Cemetery, |
| Relatives: | David Hammel (uncle) |
| Alma Mater: | Lawrence University Columbia Law School |
Leopold Hammel (August 24, 1858February 26, 1929) was an American lawyer and Democratic politician. He was a prominent lawyer in Milwaukee for nearly 40 years and served as district attorney of Milwaukee County (1893 - 1895). Earlier in his career, he represented Outagamie County in the Wisconsin State Assembly for four years (1885 - 1889).
Born in Rochester, New York, Hammel moved to Appleton, Wisconsin, in 1866. In 1877, Hammel graduated from Lawrence University and went to the Columbia Law School. Hammel was admitted to the Wisconsin bar and practiced law in Appleton. In 1885 and 1887, Hammel served in the Wisconsin State Assembly and was a Democrat.[1] Later, Hammel moved to Milwaukee, Wisconsin and continued to practice law. Hammel served as district attorney for Milwaukee County, Wisconsin. Hammel died of a heart attack in Milwaukee, Wisconsin.[2]