William J. Green Jr.
Member of the U.S. House of Representatives from Pennsylvania's 5th district
In office January 3, 1949 – December 21, 1963
Preceded by	George W. Sarbacher Jr.
Succeeded by	William J. Green III
In office January 3, 1945 – January 3, 1947
Preceded by	C. Frederick Pracht
Succeeded by	George W. Sarbacher Jr.
Personal details
Born	(1910-03-05)March 5, 1910 Philadelphia, Pennsylvania, U.S.
Died	December 21, 1963(1963-12-21) (aged 53) Philadelphia, Pennsylvania, U.S.
Resting place	Holy Sepulchre Cemetery, Cheltenham Township, Pennsylvania, U.S.
Political party	Democratic
Spouse	Mary Kelly
Children	6, including William III Anne Green Michals
Relatives	Bill Green IV (grandson)
Alma mater	St. Joseph's College
Military service
Allegiance	United States
Branch/service	United States Army
Years of service	1944
Rank	Private

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

William J. Green was born in Philadelphia, Pennsylvania, the son of Irish immigrants.^[1] He graduated from St. Joseph's Preparatory School, and attended St. Joseph's College in Philadelphia. He was engaged in business as an insurance broker in Philadelphia in 1937. He served in the United States Army as a private in the Quartermaster Corps from March 22, 1944, to December 4, 1944.

He was elected to Congress in 1944, and after a defeat in the Republican landslide year of 1946, was reelected to Congress in 1948 and every two years thereafter until his death at age 53. He had been elected Democratic City Chairman in 1953, and, in that role, held until his death, he helped solidify Philadelphia as a Democratic stronghold.

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.^[3] He was succeeded in Congress by his son, William J. Green III, who was 25 years old at the time of his first election, and later became Mayor of Philadelphia.

The William J. Green Jr. Federal Building, at 6th and Arch streets in Philadelphia, is named for him.

• List of United States Congress members who died in office (1950–99)