James Henry O'Brien (July 15, 1860 – September 2, 1924 in Brooklyn) was an American politician from New York. A Democrat, he served terms in the New York State Senate and United States House of Representatives.
He became a resident of the town of East New York, which was later incorporated into the city of Brooklyn. O'Brien worked as a machinist and mechanical engineer, and later owned and operated the J. H. O'Brien Scale & Supply Company, a business which manufactured commercial scales and equipment used in constructing overhead tramways.
O'Brien became active in politics as a Democrat. He was a member of the New York State Senate (10th D.) in 1911 and 1912. While in the Senate, he served as chairman of the Agriculture Committee, and was chairman of the state's Food Investigating Commission.
After leaving Congress, O'Brien resumed management of his business interests. He served as a delegate to the Democratic National Convention in 1916. He died in Brooklyn on September 2, 1924, and was buried at Holy Cross Cemetery.
- "Delegates Elected". New York Times. New York, NY. April 5, 1916.
- "J. H. O'Brien, Dies, Ex-Congressman". Brooklyn Daily Eagle. Brooklyn, NY. September 3, 1924.
- United States Congress. "James H. O'Brien (id: O000012)". Biographical Directory of the United States Congress.
|New York State Senate|
|Preceded by |
| New York State Senate |
Herman H. Torborg
|U.S. House of Representatives|
|Preceded by |
Henry M. Goldfogle
| Member of the U.S. House of Representatives |
from New York's 9th congressional district
Oscar W. Swift
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