| Robert Sorgenfrey | |
| Birth Date: | 14 August 1915[1] |
| Birth Place: | Sunbury, Iowa |
| Death Date: | [2] |
| Death Place: | Los Angeles, California |
| Nationality: | American |
| Fields: | general topology |
| Workplaces: | University of California, Los Angeles |
| Alma Mater: | University of Texas at Austin |
| Thesis Title: | Concerning Triodic Continua |
| Thesis Year: | 1941 |
| Doctoral Advisor: | R.L. Moore |
Robert Henry Sorgenfrey (August 14, 1915 – January 7, 1996) was an American mathematician and Professor Emeritus of Mathematics at the University of California, Los Angeles.[3] The Sorgenfrey line and the Sorgenfrey plane are named after him; the Sorgenfrey line was the first example of a normal topological space whose product with itself is not normal.