| Honorific-Prefix: | The Honorable |
| William J. Duffy | |
| Office: | of the 8th District of |
| Term Start: | August 1, 1982 |
| Term End: | July 31, 1988 |
| Predecessor: | Clarence W. Nier |
| Successor: | Harold Vernon Froehlich |
| Office1: | Wisconsin Circuit Judge |
| Term Start1: | August 1, 1978 |
| Term End1: | July 31, 1992 |
| Predecessor1: | Transitioned from 14th Circ. |
| Successor1: | Susan Bischel |
| Term Start2: | June 1968 |
| Term End2: | July 31, 1978 |
| Predecessor2: | Position established |
| Successor2: | Circuit abolished |
| State3: | Wisconsin |
| State Assembly3: | Wisconsin |
| District3: | Brown 2nd |
| Term Start3: | January 1, 1949 |
| Term End3: | January 1, 1951 |
| Predecessor3: | Harvey Larsen |
| Successor3: | Harvey Larsen |
| Birth Date: | 29 October 1916 |
| Birth Place: | North Branch, Minnesota, US |
| Death Place: | Green Bay, Wisconsin, US |
| Restingplace: | Allouez Catholic Cemetery, Green Bay, Wisconsin |
| Party: | Democratic |
| Spouse: | Elizabeth Boyden (m. 1950; died 1999) |
| Children: | 5 |
| Allegiance: | United States |
| Serviceyears: | 1941–1945 |
| Rank: | Captain |
| Battles: | World War II |
William J. Duffy (October 29, 1916February 25, 2013) was an American lawyer, politician, and judge. He served 24 years as a Wisconsin circuit court judge in Brown County (1968 - 1992), and was chief judge of Wisconsin's 8th judicial district from 1982 to 1988. Earlier in his career, he served one term in the Wisconsin State Assembly (1949), representing Brown County as a Democrat.
Born in North Branch, Minnesota, Duffy grew up in Hollandtown, Wisconsin, and graduated from Kaukauna High School. He graduated from St. Norbert College and received his law degree from the University of Wisconsin Law School in 1941. Later that year, he joined the United States Army Air Forces for service in World War II. He served throughout the war in the Pacific theater, rising to the rank of Captain.[1] [2] [3]
After the war, he practiced law in Green Bay, Wisconsin, in a partnership with attorney Jerry Clifford. In 1948 he defeated incumbent Republican Assemblyman Harvey Larsen to serve in the Wisconsin State Assembly for the 1949-1950 session.[4] Larsen came back and defeated Duffy in 1950, ending his brief career in the Assembly. Duffy returned to his legal practice.[1] [3]
In 1967, the Wisconsin Legislature created a third branch in the 14th judicial circuit. Duffy ran unopposed in the special election for the new circuit court judgeship, and would remain on the circuit court in Brown County for the next 24 years, earning re-election in 1974, 1980, and 1986. In 1982, he was selected as Chief Judge for the 8th Judicial Administrative District by the Wisconsin Supreme Court. He served the maximum 3 two-year terms as Chief Judge.[1]
Judge Duffy retired from the court in 1992, but continued to work as a reserve judge and remained an active member of the community in the city of Green Bay.[1] He served on the faculty of the University of Wisconsin–Green Bay from 1970 to 1975, teaching labor law, he was the first president of the Green Bay Voluntary Commission on Human Rights, and was a member of the Governor's Commission on Human Rights.[3]
In May 1950, Duffy married Elizabeth Boyden. Judge Duffy died on February 25, 2013, in Green Bay, Wisconsin, at age 96. His wife preceded him in death. They were survived by five children and ten grandchildren.[1] [3]
| colspan="6" style="text-align:center;background-color: #e9e9e9;"| General Election, November 2, 1948| colspan="6" style="text-align:center;background-color: #e9e9e9;"| General Election, November 7, 1950
| colspan="6" style="text-align:center;background-color: #e9e9e9;"| General Election, April 2, 1968
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