| John R. Bartels | |
| Office: | Senior Judge of the United States District Court for the Eastern District of New York |
| Term Start: | December 31, 1973 |
| Term End: | February 13, 1997 |
| Office1: | Judge of the United States District Court for the Eastern District of New York |
| Term Start1: | July 30, 1959 |
| Term End1: | December 31, 1973 |
| Appointer1: | Dwight D. Eisenhower |
| Predecessor1: | Robert Alexander Inch |
| Successor1: | Henry Bramwell |
| Birth Name: | John Ries Bartels |
| Birth Date: | 8 November 1897 |
| Birth Place: | Baltimore, Maryland, U.S. |
| Death Place: | Brooklyn, New York, U.S. |
| Residence: | Brooklyn Heights[1] |
| Education: | Harvard Law School (LL.B.) |
John Ries Bartels (November 8, 1897 – February 13, 1997) was a United States district judge of the United States District Court for the Eastern District of New York.
Born on November 8, 1897, in Baltimore, Maryland, Bartels received an Artium Baccalaureus degree in 1920 from Johns Hopkins University and a Bachelor of Laws in 1923 from Harvard Law School. He served in the United States Army in 1918. He entered private practice in New York City, New York from 1925 to 1959. He was a member of the New York State Law Review Commission from 1945 to 1950 and again from 1952 to 1957. He was a Justice of the New York Supreme Court for Kings County from 1950 to 1951.
Bartels was nominated by President Dwight D. Eisenhower on April 20, 1959, to a seat on the United States District Court for the Eastern District of New York vacated by Judge Robert Alexander Inch. He was confirmed by the United States Senate on July 28, 1959, and received his commission on July 30, 1959. He assumed senior status on December 31, 1973. His service terminated on February 13, 1997, due to his death in Brooklyn, New York.