Eugene Franklin O'Connor (November 10, 1844 – March 26, 1928) was an American lawyer and politician from New York.
In November 1862, during the American Civil War, O'Connor enrolled in the 176th New York Volunteer Infantry under the name "Eugene Franklin." He was promoted to corporal of Company K in January 1863. In January 1864, he was again promoted to second lieutenant. In October 1864, he was wounded at the Battle of Cedar Creek. Because of his wounds from the battle, he was discharged in December 1864.
After the War, O'Connor became captain of the Mohawk Club, a Brooklyn baseball team. He worked as a civil engineer for the Union Pacific Railroad. He attended New York University School of Law and graduated with a law degree in 1882.
In 1886, O'Connor was the Republican candidate for New York's 4th congressional district, but lost the election to incumbent Peter P. Mahoney. In 1887, he was elected to the New York State Senate, representing the 3rd District. He served in the Senate in 1888 and 1889. In the 1891 New York state election, he was the Republican candidate for Secretary of State of New York, but he lost the election to incumbent Frank Rice. In 1904, Mayor McClellan appointed him to the New York City Civil Service Commission. In 1910, New York City Comptroller William A. Prendergast appointed him auditor of accounts.
- The Argus Almanac: A Political and Financial Annual For 1889. 1889. p. 141.
- Documents of the Assembly of the State of New York. Volume XXXV, Part 5. J. B. Lyon Company. 1911. p. 4002.
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- "Senator O'Connor, Star of Mohawks, Played Ball Across the Continent". The Brooklyn Daily Eagle. 4 March 1917.
- Maxwell, W. J. (1916). General Alumni Catalogue of New York University, 1916. p. 104.
- "Election". The Brooklyn Union. 2 November 1886.
- Lloyd, Will L. (1892). The New York Red Book. Albany: James B. Lyon. p. 73.
- "Mayor M'Clellan Takes Office, Surrounded by Cabinet - New Mayor Swears in Members of His Cabinet". The Brooklyn Citizen. 2 January 1904.
- "Two Auditors Appointed". The Brooklyn Daily Eagle. 2 May 1910.
- "Senator O'Connor Dies in 83d Year After Long Illness". The Standard Union. 26 March 1928.
- "Eugene F. O'Connor Mourned by 1,000". The Brooklyn Daily Times. 29 March 1928.
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