Eugene O’Dunne or Eugene Antonio Dunne (June 22, 1875 – October 30, 1959) was a judge of the Supreme Bench of Baltimore City.
Born in Tucson, O'Dunne was the son Judge Edmund F. Dunne, who was Chief Justice of the Arizona Territory at the time. His mother Josephine Cecelia Warner, though originally from Mississippi herself, was part of an old Virginia family. In 1894 he graduated from St. Mary's College (now Belmont Abbey) in North Carolina. Two years later he would receive an M.A. from St. Mary's as well. It was during this time that Eugene legally changed his last name to the ancestral family name of O'Dunne, while at the same time dropping his middle name of Antonio. This was done as to further emphasize his Irish heritage. He practiced law with his father in Jacksonville, FL at the firm of Dunne and O'Dunne. He later went on to receive a law degree in 1900 from the University of Maryland.
In 1904, Judge O’Dunne was married to the great grandniece of John Quincy Adams. He and his spouse owned a home in Baltimore and a summer residence in Blue Ridge Summit, located in Pennsylvania. The couple had six children together: Mrs. E. Gettings Merryman, Eugene O’Dunne Jr., Mrs. John P Winand, Samillon O’Dunne, Hamilton O’Dunne and David O’Dunne. Eugene’s wife suffered from paralysis and died on August 30, 1935. Years after her death, O’Dunne would later remarry to Mrs. Helen Keep in 1950. Eugene O'Dunne is also the older brother of noted Santa Fe society columnist and author Brian Boru Dunne (1877–1962), who wrote for The Santa Fe New Mexican for most of the first half of the 20th century.