John C. Knox
Senior Judge of the United States District Court for the Southern District of New York
In office April 30, 1955 – August 23, 1966
Chief Judge of the United States District Court for the Southern District of New York
In office 1948–1955
Preceded by	Office established
Succeeded by	William Bondy
Judge of the United States District Court for the Southern District of New York
In office April 12, 1918 – April 30, 1955
Appointed by	Woodrow Wilson
Preceded by	Martin Thomas Manton
Succeeded by	Richard Harrington Levet
Personal details
Born	John Clark Knox (1881-10-13)October 13, 1881 Waynesburg, Pennsylvania
Died	August 23, 1966(1966-08-23) (aged 84)
Education	Waynesburg College (AB) University of Pennsylvania Law School read law

John Clark Knox (October 13, 1881 – August 23, 1966) was a United States district judge of the United States District Court for the Southern District of New York from 1918 to 1966 and its first chief judge from 1948 to 1955.

Born on October 13, 1881, in Waynesburg, Pennsylvania, Knox received an Artium Baccalaureus degree in 1902 from Waynesburg College and after attending the University of Pennsylvania Law School, read law in 1904. He was an attorney with the Law Department of the Title Guarantee and Trust Company in New York City, New York from 1905 to 1913. He was an Assistant United States Attorney for the Southern District of New York from 1913 to 1918.^[1]

Knox was nominated by President Woodrow Wilson on March 29, 1918, to a seat on the United States District Court for the Southern District of New York vacated by Judge Martin Thomas Manton. He was confirmed by the United States Senate on April 12, 1918, and received his commission the same day. He served as chief judge from 1948 to 1955. He assumed senior status on April 30, 1955. His service terminated on August 23, 1966, due to his death.^[1]

Knox wrote two books on his judicial service, A Judge Comes of Age (1940) and Order in the Court (1943).^{[citation needed]}

• List of United States federal judges by longevity of service

• John C. Knox at the Biographical Directory of Federal Judges, a publication of the Federal Judicial Center.