James Stevenson Smart (June 14, 1842 – September 17, 1903) was a U.S. Representative from New York.
Born in Baltimore, Maryland on June 14, 1842, Smart moved with his parents to Coila, part of Cambridge, Washington County, New York, in 1849.
He attended Cambridge Academy and Union College in Schenectady, and graduated from Jefferson College (now Washington & Jefferson College) in Canonsburg, Pennsylvania in 1863.
While in college, Smart became a member of the Sigma Chi fraternity.
Smart entered the Union Army in January 1864 as First Lieutenant in the 16th New York Heavy Artillery Regiment.
He was promoted to Captain and commander of the regiment's Company K. The regiment took part in action in Virginia and North Carolina, including the Second Battle of Fort Fisher and he served until after the war, receiving his discharge in August 1865.
Smart was a newspaper writer and editor, and became publisher of the Washington County Post.
He was elected as a Republican to the Forty-third Congress (March 4, 1873 – March 3, 1875). He was not a candidate for renomination in 1874.