John C. Kluczynski

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.

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 1933-1948.

Kluczynski was elected to the Illinois Senate in 1948 and served until December 1949, having become a 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. 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.

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.