Bernard "Barney" Hahn (August 24, 1860 – September 6, 1931) was a farmer and a politician.
Born in Luxemburg, Kewaunee County, Wisconsin, Hahn went to public school.
He moved with his parents to Sturgeon Bay, Wisconsin where they owned a hotel.
Later, Hahn built the first opera house in Sturgeon Bay.
Hahn was a farmer and grew fruit.
He lived in Fish Creek, Door County, Wisconsin.
Hahn served in the Wisconsin State Assembly and was a Republican.
Hahn died in a hospital in Sturgeon Bay, Wisconsin from complications after surgery.
In 1931, Hahn was charged with arson for setting fire to his personal property; the arson case ended when he died.