Daniel O. Mahoney (June 8, 1854September 21, 1944) was an American lawyer, judge, and Republican politician from Viroqua, Wisconsin. He served two terms in the Wisconsin State Assembly, representing Vernon County in the 1893 and 1895 terms. Later, he served as a county judge.
Mahoney was born on June 8, 1854, in Moscow, New York. He died on September 21, 1944.
Mahoney was a member of the Assembly during the 1893 and 1895 sessions. Other positions he held include County Superintendent of Vernon County, Wisconsin. He was a Republican.
He ran for U.S. House of Representatives in Wisconsin's 3rd congressional district in 1908, but lost in the Republican primary to Arthur W. Kopp.