William Joseph Wynn (June 12, 1860 â January 4, 1935) was an American machinist and politician who served as a U.S. Representative from California for one term from 1903 to 1905.
Born to Irish parents in San Francisco, California, Wynn attended the public schools of San Francisco. He was an apprentice in the machinist's trade and subsequently worked in the principal manufacturing establishments of San Francisco. He then served as member of the San Francisco Board of Supervisors from January 8, 1902, to March 4, 1903.
Wynn was elected as a Union Labor Democrat to the 58th Congress, serving from 1903 to 1905. During his tenure, he opposed Union Labor boss Abe Ruef and subsequently lost the party's nomination in 1904. Though he still had the Democratic ballot line, he lost to Republican Everis A. Hayes.
He then worked in the insurance business in San Francisco until his death on January 4, 1935. He is interred at Holy Cross Cemetery in Colma, California.
Wynn was an active member of the Native Sons of the Golden West.