Warner Lewis Underwood (August 7, 1808 - March 12, 1872) was an attorney, diplomat, state legislator, and U.S. Representative from Kentucky, the brother of Joseph Rogers Underwood.
Born in Goochland County, Virginia, Underwood completed preparatory studies. He moved to Kentucky in 1825. He was graduated from the University of Virginia at Charlottesville in 1829. He studied law. He was admitted to the bar and commenced practice in Bowling Green. Kentucky, in 1830. He moved to Texas in 1834; Attorney General for the eastern district of Texas. He returned to Bowling Green, Kentucky, in 1840. He served as member of the State house of representatives in 1848. He served in the State senate 1849-1853.
Underwood was elected as the candidate of the American Party to the Thirty-fourth and Thirty-fifth Congresses (March 4, 1855-March 3, 1859). He was not a candidate for renomination. United States consul to Glasgow, Scotland, from July 17, 1862, until September 30, 1864. He returned to the United States and practiced law in San Francisco, California. He returned to Kentucky in 1866 and resumed the practice of law. He died near Bowling Green, Kentucky, March 12, 1872.