Henry Onderdonk Floyd-Jones (January 3, 1792 — December 20, 1862) was an American politician from New York.
He was born at the family mansion on the Fort Neck estate in South Oyster Bay, New York (then Queens, now Nassau County) as the son of David Richard Floyd-Jones (1764–1826) and Sarah (Onderdonk) Floyd-Jones (1758–1844). He married Helen Watts (1792–1872), and they had several children, among them State Senator Edward Floyd-Jones (1823–1901) and Col. DeLancey Floyd-Jones (1826–1902).
He was a member of the New York State Assembly (Queens Co.) in 1829 and 1830.
He was a member of the New York State Senate (1st D.) from 1836 to 1839, sitting in the 59th, 60th, 61st and 62nd New York State Legislatures.
Lt. Gov. David R. Floyd-Jones (1813–1871) was his nephew; Bishop William H. DeLancey (1797–1865) and Susan DeLancey, the wife of James Fenimore Cooper (1789–1851), were his first cousins.