Charles Zephaniah Platt (July 22, 1773 Poughkeepsie, Rensselaer County, New York – April 14, 1822 Greenbush, Rensselaer Co., NY) was an American politician.
He was the son of Zephaniah Platt and Mary Van Wyck Platt (1743–1809).
On October 4, 1803, he married Sarah Bleecker at the Dutch Reformed Church in Albany, New York, and they had six children.
He was a member of the New York State Assembly (Oneida Co.) in 1807, and as a Federalist, was New York State Treasurer from 1813 to 1817.
Jonas Platt was his brother, and Michigan Att. Gen. Zephaniah Platt was his nephew.