Nehemiah Platt (July 25, 1797 – March 29, 1851) was an American politician from New York.
He married Diantha Wilson (1804–1866), and they had several children. He was Supervisor of the Town of Nichols from 1825 to 1827.
He was a member of the New York State Senate (3rd D.) from 1841 to 1844, sitting in the 64th, 65th, 66th and 67th New York State Legislatures.
U.S. Senator Thomas C. Platt (1833–1910) was his nephew.