John Armstrong Smith (September 23, 1814 – March 7, 1892) was an American lawyer and politician who served two terms as a U.S. Representative from Ohio from 1869 to 1873.
Born in Hillsboro, Ohio, Smith pursued classical studies and was graduated from Miami University, Oxford, Ohio, in 1834.
He was admitted to the bar in 1835 and commenced practice in Hillsboro, Ohio.
He served as member of the State constitutional convention of Ohio in 1850.
He served as member of the State constitutional convention of 1873.