John Sudam (March 23, 1782 – April 13, 1835 Albany, New York) was an American politician from New York.
He married Ann Tallmadge (1775–1809), a sister of James Tallmadge, Jr. and Matthias B. Tallmadge. 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.
He was buried at the Sharp Burying Ground in Kingston, Ulster County, New York.