John P. Barnes | |
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| Senior Judge of the United States District Court for the Northern District of Illinois | |
| In office September 15, 1957 – December 31, 1958 | |
| Chief Judge of the United States District Court for the Northern District of Illinois | |
| In office 1948–1957 | |
| Preceded by | Office established |
| Succeeded by | Philip Leo Sullivan |
| Judge of the United States District Court for the Northern District of Illinois | |
| In office March 4, 1931 – September 15, 1957 | |
| Appointed by | Herbert Hoover |
| Preceded by | Seat established by 46 Stat. 1417 |
| Succeeded by | Julius Howard Miner |
| Personal details | |
| Born | John Peter Barnes March 15, 1881 Beaver County, Pennsylvania |
| Died | April 10, 1959 (aged 78) Elgin, Illinois |
| Education | Geneva College (B.S.) University of Michigan Law School (LL.B.) |
John Peter Barnes (March 15, 1881 – April 10, 1959) was a United States district judge of the United States District Court for the Northern District of Illinois.