| John Caskie Collet | |
| Office: | Judge of the United States Court of Appeals for the Eighth Circuit |
| Term Start: | July 9, 1947 |
| Term End: | December 5, 1955 |
| Appointer: | Harry S. Truman |
| Predecessor: | Kimbrough Stone |
| Successor: | Charles Evans Whittaker |
| Office1: | Judge of the United States District Court for the Eastern District of Missouri Judge of the United States District Court for the Western District of Missouri |
| Term Start1: | March 20, 1937 |
| Term End1: | July 11, 1947 |
| Appointer1: | Franklin D. Roosevelt |
| Predecessor1: | Seat established by 49 Stat. 1804 |
| Successor1: | Roy Winfield Harper |
| Office2: | Judge of the Supreme Court of Missouri |
| Term Start2: | 1935 |
| Term End2: | March 20, 1937[1] |
| Appointer2: | Guy Brasfield Park |
| Predecessor2: | Walter D. Coles |
| Birth Name: | John Caskie Collet |
| Birth Date: | 25 May 1898 |
| Birth Place: | Keytesville, Missouri |
| Death Place: | Kansas City, Missouri |
| Education: | read law |
John Caskie Collet (May 25, 1898 – December 5, 1955) was a United States circuit judge of the United States Court of Appeals for the Eighth Circuit and previously was a United States district judge of the United States District Court for the Eastern District of Missouri and the United States District Court for the Western District of Missouri.
Born in Keytesville, Missouri, Collet was in the United States Army Air Corps from 1917 to 1918, and read law in 1920. He was city attorney of Salisbury, Missouri from 1922 to 1924, and then county prosecutor for Chariton County, Missouri from 1925 to 1929. He then served as assistant counsel to the Missouri State Highway Department from 1930 to 1933. He became Chairman of the Missouri Public Service Commission in 1933, and then became a Judge of the Missouri Supreme Court from 1935 to 1937.
Collet was nominated by President Franklin D. Roosevelt on March 9, 1937, to the United States District Court for the Eastern District of Missouri and the United States District Court for the Western District of Missouri, to a new joint seat authorized by 49 Stat. 1804. He was confirmed by the United States Senate on March 15, 1937, and received his commission on March 20, 1937. His service terminated on July 11, 1947, due to his elevation to the Eighth Circuit.
Collet was nominated by President Harry S. Truman on April 30, 1947, to a seat on the United States Court of Appeals for the Eighth Circuit vacated by Judge Kimbrough Stone. He was confirmed by the Senate on July 8, 1947, and received his commission on July 9, 1947. His service terminated on December 5, 1955, due to his death in Kansas City, Missouri.