Henry L. O'Brien (c. 1869 – February 8, 1935) was an American politician from New York.
He engaged in the real estate and insurance business.
O'Brien was elected on January 9, 1930, to the New York State Senate (9th D.) to fill the vacancy caused by the resignation of Charles E.
[1] The State Board of Canvassers rejected a contest by his defeated Republican opponent William Koch, and certified O'Brien's election on January 20.
He died on February 8, 1935,[3] at the home of his niece at 120 Pierrepont Street in Brooklyn, after an illness of six months.