John William Henderson Underwood (November 20, 1816 – July 18, 1888) was a U.S.
Democratic politician.
He was born in Elberton, Georgia.
He was elected as a Democrat to the United States House of Representatives from Georgia and served from March 4, 1859 until January 23, 1861, when he withdrew, having joined the Confederacy.
He died in Rome, Georgia and buried in Myrtle Hill Cemetery.