| Sándor Korányi | |
| Birth Date: | 18 June 1866 |
| Birth Place: | Pest, Hungary |
| Death Place: | Budapest, Hungary |
| Nationality: |  Hungary |
| Fields: | Medicine |
| Workplaces: | Budapest University |
Baron Sándor Korányi de Tolcsva (Pest, 18 June 1866 – Budapest, 12 April 1944) was a Hungarian physician specializing in internal medicine, member of the Hungarian Academy of Sciences and House of Magnates.
He was the elder son of Frigyes Korányi, Sr. and brother of Frigyes Korányi, Jr. too. His mother was Malvin Bónis, of Calvinist Hungarian noble descent.He was nominated for the Nobel prize 13 times between 1901 and 1937.