William Henry Wadsworth (July 4, 1821 – April 2, 1893) was a U.S. Representative from Kentucky.

William H. Wadsworth
Member of the U.S. House of Representatives from Kentucky's 9th district
In office March 4, 1885 – March 3, 1887
Preceded by	Laban T. Moore
Succeeded by	Samuel McKee
In office March 4, 1861 – March 3, 1865
Preceded by	William Wirt Culbertson
Succeeded by	George M. Thomas
Member of the Kentucky Senate
In office 1853–1856
Personal details
Born	(1821-07-04)July 4, 1821 Maysville, Kentucky, U.S.
Died	April 2, 1893(1893-04-02) (aged 71) Maysville, Kentucky, U.S.
Resting place	Maysville Cemetery
Political party	Unionist Republican
Alma mater	Augusta College
Profession	Lawyer
Signature
Military service
Allegiance	Union
Branch/service	Union Army
Rank	Colonel
Battles/wars	Battle of Ivy Mountain (American Civil War)

Born in Maysville, Kentucky, Wadsworth attended town and county private schools. He studied law and graduated from Augusta College, Bracken County, Kentucky, in 1841. He was admitted to the bar in 1844 and commenced practice in Maysville, Kentucky. He served as member of the Kentucky State Senate from 1853 to 1856. He served as presidential elector on the Constitutional Union ticket in 1860.

Wadsworth was elected as a Unionist to the Thirty-seventh and Thirty-eighth Congresses (March 4, 1861 – March 3, 1865). His vote on the Thirteenth Amendment is recorded as nay. He was not a candidate for renomination in 1864.

During the Civil War Wadsworth served as aide to General Nelson, with the rank of colonel, at the Battle of Ivy Mountain. He was appointed United States commissioner to Mexico, under the treaty of Washington for the adjustment of claims, by President Grant in 1869.

Wadsworth was elected as a Republican to the Forty-ninth Congress (March 4, 1885 – March 3, 1887). He was not a candidate for renomination in 1886. He resumed the practice of law. He died in Maysville, Kentucky, April 2, 1893. He was interred in Maysville Cemetery.