John Hyatt Smith (April 10, 1824 – December 7, 1886) was a United States representative from New York.
Born in Saratoga, he was taught by his father and employed for a time as a clerk in Detroit and later as a bank clerk in Albany, New York; while in the latter position he studied theology.
He officiated in Cleveland, Ohio for three years, in Buffalo from 1855 to 1860, and in Philadelphia from 1860 to 1866.
During the Civil War he served in Virginia with the United States Christian Commission in 1862, and was chaplain of the Forty-seventh Regiment, National Guard of New York, in 1869.
He appointed by President Chester A. Arthur a commissioner to inspect the Pacific Railroad, after which he resumed a pastorate in Brooklyn.