Medicus is Latin for doctor or physician, and may more specifically refer to:
- Friedrich Kasimir Medikus (1738–1808), German physician and botanist
- Henry Medicus (b. ?), part-owner of Brooklyn Dodgers from 1905–1912
- Medicus, a journal edited by students of the Yerevan State Medical University
- Medicus (novel), a novel by Ruth Downie
- Medicus, a fictional doctor in the television series Spartacus: Blood and Sand