William Joseph Green Jr. (March 5, 1910 – December 21, 1963) was a Democratic member of the U.S. House of Representatives from Pennsylvania.

Green was born in Philadelphia, Pennsylvania, the son of Irish immigrants.

He served in the United States Army as a private in the Quartermaster Corps from March 22, 1944, to December 4, 1944.

Green died of peritonitis and gall bladder complications in Philadelphia on December 21, 1963[2] and was interred at Holy Sepulchre Cemetery in Cheltenham Township, Pennsylvania.

Green III, who was 25 years old at the time of his first election, and later became Mayor of Philadelphia.