John Benjamin Gedney (June 4, 1809 – 1859) was an American politician from New York.
He was a member of the Gedney family, and lived at White Plains, Westchester County, New York. He married Ann McFarquhar (d. 1890).
He was one of the first three Inspectors of State Prisons elected on the Whig ticket in 1847 under the New York State Constitution of 1846, and drew the one-year term, being in office in 1848.