| John Watson Lungstrum | |
| Office: | Senior Judge of the United States District Court for the District of Kansas |
| Term Start: | November 2, 2010 |
| Office1: | Chief Judge of the United States District Court for the District of Kansas |
| Term Start1: | 2001 |
| Term End1: | 2007 |
| Predecessor1: | George Thomas Van Bebber |
| Successor1: | Kathryn H. Vratil |
| Office2: | Judge of the United States District Court for the District of Kansas |
| Term Start2: | November 5, 1991 |
| Term End2: | November 2, 2010 |
| Appointer2: | George H. W. Bush |
| Predecessor2: | Dale E. Saffels |
| Successor2: | Daniel D. Crabtree |
| Birth Date: | 2 November 1945 |
| Birth Place: | Topeka, Kansas, U.S. |
| Education: | Yale University (BA) University of Kansas (JD) |
John Watson Lungstrum (born November 2, 1945) is a senior United States district judge of the United States District Court for the District of Kansas.
Lungstrum was born in Topeka, Kansas. He grew up in Kansas City, Missouri, where he graduated from the Pembroke Country-Day School in 1963. He received a Bachelor of Arts degree from Yale University in 1967 where he was a prominent leader of the Yale Political Union. He received a Juris Doctor from the University of Kansas School of Law in 1970. He practiced law in Los Angeles, California from 1970 to 1971, after which he served as a lieutenant in the United States Army from 1971 to 1972. He reentered private practice in Lawrence, Kansas from 1972 to 1991, during which time he was a lecturer at the University of Kansas School of Law.
On July 24, 1991, President George H. W. Bush nominated Lungstrum to be a United States district judge of the United States District Court for the District of Kansas, to fill the seat vacated by Judge Dale E. Saffels, who assumed senior status on November 16, 1990. The United States Senate confirmed Lungstrum's nomination on October 31, 1991, and he received his commission on November 5, 1991. From 2001 and 2007, he served as the chief judge. Lungstrum assumed senior status on November 2, 2010.