| Aleksander Zalewski | |
| Birth Date: | 3 May 1854 |
| Birth Place: | Radziwie, Congress Poland |
| Death Place: | Lemberg, Austria-Hungary |
| Nationality: | Polish |
| Fields: | Botany |
| Workplaces: | Lviv University. |
Aleksander Zalewski (3 May 1854 – 20 October 1906) was a Polish botanist, professor of Lviv University.
Zalewski was an author of mycologic and physiographic works, in which he described flora of Poland.