John Carl Kluczynski (February 15, 1896 – January 26, 1975) was a U.S. Representative from Illinois, representing the 5th district from 1951 until his death from a heart attack in Chicago, Illinois in 1975.

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John Carl Kluczynski
Member of the U.S. House of Representatives from Illinois's 5th district
In office January 3, 1951 – January 26, 1975
Preceded by	Martin Gorski
Succeeded by	John G. Fary
Member of the Illinois Senate
In office 1948–1949
Member of the Illinois House of Representatives
In office 1933–1948
Personal details
Born	(1896-02-15)February 15, 1896 Chicago, Illinois, U.S.
Died	January 26, 1975(1975-01-26) (aged 78) Chicago, Illinois, U.S.
Political party	Democratic

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Born in Chicago, Illinois to Thomas Kluczynski and Mary Kluczynski, née Sulaski, Kluczynski attended public and parochial schools, and during the First World War served overseas as a corporal with the Eighth Field Artillery in 1918 and 1919.

He worked in the catering business upon returning to Chicago, and served in the Illinois House of Representatives from 1933 through 1948. In 1948, Kluczynski was elected to the Illinois Senate in 1948 where he served until December 1949. He resigned in 1949 to run as candidate for Congress.

Kluczynski was elected as a Democrat to the Eighty-second Congress. He was reelected to the twelve succeeding Congresses, and served from January 3, 1951, until his death from a heart attack January 26, 1975, in Chicago.^[1]

He voted in favor of the Civil Rights Act of 1957.^[2]

While in Congress, he served as chairman of the Public Works subcommittee on transportation.^[3]

He was interred in Resurrection Mausoleum, Justice, Illinois.

The office building at the Chicago Federal Center, known as the Kluczynski Federal Building, was named in Kluczynski's honor after his death in 1975.^[4]

He was a Polish-American, active in the life of his community as a member of the Polish National Alliance and Polish Roman Catholic Union of America.^[5]

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