| Reuben Leon Kahn | |
| Birth Date: | 1887 7, mf=y |
| Birth Place: | Kovno, Russian Empire |
| Death Place: | Miami |
| Citizenship: | United States |
| Field: | immunology, especially serology |
| Alma Mater: | New York University doctor of science in bacteriology (1916), Yale University masters degree in physiological chemistry (1913), Valparaiso University bachelors degree in medicine (1909) and honorary doctorate (1944)[1] |
| Known For: | test for syphilis |
Reuben Leon Kahn (July 26, 1887 in Kovno, Russian Empire – July 22, 1979 in Miami) was an American immunologist.
He is best known for his investigations of blood reactions, like the Kahn test, an efficient test for syphilis.