John William Clancy
John William Clancy (February 24, 1899 – March 2, 1969) was a United States federal judge.
On June 15, 1936, Clancy was nominated by President Franklin D. Roosevelt to a new seat on the United States District Court for the Southern District of New York created by 49 Stat. 1491. He was confirmed by the United States Senate on June 20, 1936, and received his commission two days later. He served as chief judge from 1956 to 1959, assuming senior status on April 3, 1959. Clancy served in that capacity until his death in New York City, in 1969.