Joseph Showalter Smith (June 20, 1824 – September 28, 1884) was an American lawyer and politician who served one term as a Representative from the U.S. state of Oregon from 1869 to 1871.

Born in Connellsville, Pennsylvania, Smith moved with his farmer parents to Ohio and Indiana, where he attended the common schools.

[1][2] He was appointed United States attorney for Washington Territory by President James Buchanan March 12, 1857.

[1] In 1862, he was selected by the Democratic convention to be their candidate for Associate Justice of the Oregon Supreme Court, but he declined the nomination.

[2] In 1866, he was the Democratic candidate for United States Senate, but lost to Republican Henry W. Corbett by three votes in the Legislature.