Daniel Bennett St. John (October 8, 1808 – February 18, 1890) was an American businessman and politician who served one term as a U.S. Representative from New York from 1847 to 1849.

Born in Sharon, Connecticut, St. John engaged in mercantile pursuits and the real estate business at Monticello, New York, in 1831.

He served as delegate to the Constitutional Union National Convention in 1860.

St. John served as chief registrar in the banking department of New York State.

He was interred in Cedar Hill Cemetery, Newburgh, New York.