| Marc C. Duff | |
| Office: | Member of the Wisconsin State Assembly |
| Constituency: | 98th district |
| Term Start: | January 4, 1993 |
| Term End: | January 6, 2003 |
| Predecessor: | Peggy Rosenzweig |
| Successor: | Scott R. Jensen |
| Constituency1: | 84th district |
| Term Start1: | January 2, 1989 |
| Term End1: | January 4, 1993 |
| Predecessor1: | John C. Schober |
| Successor1: | Mary Lazich |
| Party: | Republican |
| Birth Date: | 4 July 1961 |
| Birth Place: | Port Washington, Wisconsin |
| Alma Mater: | University of Wisconsin-Whitewater Robert M. La Follette Institute of Public Affairs |
Marc C. Duff (born July 4, 1961) is a former member of the Wisconsin State Assembly.
Duff was born on July 4, 1961, in Port Washington, Wisconsin.[1] He graduated from New Berlin Eisenhower Middle/High School in New Berlin, Wisconsin as well as the University of Wisconsin-Whitewater and the Robert M. La Follette Institute of Public Affairs at the University of Wisconsin-Madison.[2] Duff is married with two children.
Duff was first elected to the Assembly in 1988. He was also a member of the Waukesha County, Wisconsin Board from 1988 to 1989. Duff was elected as a Republican.
Duff was the CFO of Racine Unified School District in Racine, Wisconsin and retired in April, 2021. Duff remains active in school business management.