John De Mott (October 7, 1790 – July 31, 1870) was an American businessman and politician who served one term as a U.S. Representative from New York from 1845 to 1847.

Born in Readington, New Jersey, De Mott moved to Herkimer County, New York, in 1793 with his parents, who settled in what is now the town of Lodi, Seneca County.

Major general of the Thirty-eighth Brigade of the State militia.

He engaged in mercantile pursuits in Lodi, New York, for more than forty years.

This article incorporates public domain material from the Biographical Directory of the United States Congress