William O'Neil (September 20, 1848 – March 3, 1917) was an American merchant, temperance advocate, and Republican politician. He was a member of the Wisconsin State Senate (1901–1904) and State Assembly (1893–1896), representing the northwest corner of the state.[1]
From 1865 to 1872 he traveled throughout the country, finally settling at Chippewa Falls, Wisconsin. In 1880 moved to Eau Claire,[2][4] and in 1886 he moved to Washburn, where he operated a small store.[4] In 1887 he was elected chairman of the town board and was re-elected multiple times.[3]
After the outbreak of the Spanish–American War in 1898, O'Neil organized a company of volunteers for service in the war and was commissioned captain of Company K in the 4th Wisconsin Infantry Regiment. The 4th Wisconsin Infantry, however, never saw any combat in the war and spent just a few months on garrison duty in Alabama.