|Mayor of Green Bay, Wisconsin|
|Preceded by||Michael Monfils|
|Succeeded by||Paul Jadin|
March 20, 1923|
Lincoln, Kewaunee County, Wisconsin
|Died||January 11, 2013(aged 89)|
|Spouse(s)||Isabelle Mastriocola (1949–2010)|
Samuel J. Halloin (March 20, 1923 - January 11, 2013) was an American politician who served as the Mayor of Green Bay, Wisconsin from 1979 to 1995. Halloin, who served for four consecutive terms, was the longest-serving Mayor of Green Bay in history.
Halloin served in the United States Army during World War II. He was a participant in the D-Day invasion of Normandy and the liberation of the Dachau concentration camp. He married Isabelle Mastriocola on June 18, 1949.
Halloin served as the city's mayor for sixteen years from 1979 to 1985. During his tenure, Halloin obtained funding for the construction of a new Walnut Street Bridge, which crosses the Fox River. Halloin helped to upgrade Lambeau Field, the home stadium of the Green Bay Packers, and acquired land for the present-day riverwalk along the Fox River.