William Singer Moorhead (April 8, 1923 – August 3, 1987) was an American politician serving as a Democratic member of the U.S. House of Representatives from the Commonwealth of Pennsylvania.

[3][4] He served in the United States Navy from 1943 until he was discharged as a lieutenant (jg.)

Moorhead was a prominent critic of Pentagon cost overruns, a leader in establishing the National Endowments for the Arts and the Humanities, floor manager of freedom of information legislation that opened government documents to the public, and chief sponsor of the bill that established a synthetic fuels corporation.

[5] He was not a candidate for reelection in 1980, and instead practiced law in the Washington firm of Coan, Couture, Lyons & Moorhead.

[5] Moorhead died of lung cancer at Johns Hopkins Hospital in Baltimore in 1987; he was 64.