William Matthew Ketchum (September 2, 1921 – June 24, 1978) was an American businessman and Republican Party politician who was a member of the California State Assembly from 1967 to 1973 and a member of the United States House of Representatives from 1973 until his death.

Ketchum owned and operated a hardware and auto-supply store from 1946 to 1950, and worked as a salesman from 1953 to 1957.

He engaged in cattle ranching and farming,[1] and was a member of the Republican State Central committee from 1964 to 1966.

On June 24, 1978, Ketchum had a heart attack at his home in Bakersfield, California, and was pronounced dead on arrival at Kern Medical Center, aged 56.

[1][3] This article incorporates public domain material from the Biographical Directory of the United States Congress