William Henry Moody (December 23, 1853 – July 2, 1917) was an American politician and jurist who held positions in all three branches of the Government of the United States.

After appointment as the District Attorney for Eastern Massachusetts in 1890, he gained widespread notoriety in 1893 as the junior prosecutor in the Lizzie Borden murder case.

He served on the powerful Appropriations Committee, and also held seats on Insular Affairs, Expenditures in the Department of Justice, and the Joint Commission on the Transportation of the Mails.

Moody also negotiated with the government of Cuba for the original lease that permitted construction and occupation of the Guantanamo Bay Naval Base.

[5] After the Lynching of Paul Reed and Will Cato, Moody refused to grant permission for an indictment, believing no federal right had been violated.

[6] Roosevelt nominated Moody as an associate justice of the United States Supreme Court on December 3, 1906, to a seat vacated by Henry B.

His most noted opinion was in the minority in the Employers Liability Cases (1908), where he held that Congress' power to regulate interstate commerce included the ability to legislate management's relationship with employees.

While he generally supported enhanced federal powers, opinions such as Twining v. New Jersey (1908), where he held that the Fifth Amendment's protection against compulsory self-incrimination did not apply to cases presented in state courts, made him hard to pigeonhole.