John Sudam, sometimes stylized Suydam, (March 23, 1782 – April 13, 1835 Albany, New York) was an American politician from New York.
He then married Mary Harrison Elmendorf (1795–1855), and they had several children.
He was a member of the New York State Senate (2nd D.) from 1823 to 1824, sitting in the 46th and 47th New York State Legislatures.
He was a Regent of the University of the State of New York from 1829 until his death.
He was again a member of the State Senate (2nd D.) from 1833 until his death, sitting in the 56th, 57th and 58th New York State Legislatures.