Coe S. Downing (April 7, 1791 — September 12, 1847) was an American politician from New York.
He married Rozetta J. Seaman (1796–1824), daughter of Assemblyman Henry O. Seaman (1769–1826), and their son was Thomas B. Downing MD (1812–1839).
He ran a tavern and livery stable.
Downing was a member of the New York State Assembly (Kings Co.) in 1830, 1831, 1832 and 1833.
He was a member of the New York State Senate (1st D.) from 1835 to 1838, sitting in the 58th, 59th, 60th and 61st New York State Legislatures.
At the time of his death, he was a justice of the Municipal Court of Brooklyn. He was buried at the Jackson Cemetery in Wantagh, New York.