Roman Denissen (July 13, 1918 – January 21, 2008) was an American politician who served as the 40th mayor of Green Bay, Wisconsin, from 1959 to 1965.
Denissen was born on July 13, 1918, in Bellevue, Wisconsin.
In 1984, he married Agnes (Johnson) Le Clair.
Denissen was elected to the City Council of Green Bay in 1952.
He served as Mayor until 1965, when he was defeated for re-election by Donald Tilleman.