| Nafi ibn al-Harith | |
| Native Name: | نافع بن الحارث |
| Death Date: | 634–635 CE |
| Nationality: | Arab |
| Occupation: | Physician |
| Known For: | Treating Sa'd ibn Abi Waqqas and Abu Bakr |
| Notable Works: | Dialog in Medicine |
| Education: | Academy of Gundishapur |
| Relatives: | Abu Bakra al-Thaqafi (half-brother) |
Nāfiʿ ibn al-Ḥārith ibn Kalada al-Thaqafī (ar|نَـافِـع ابْـن الْـحَـارِث ابْـن كَـلَـدة الـثَّـقَـفِي) (died 13 AH / 634 – 635 CE)) was an Arab physician of the Banu Thaqif. He was recommended by Muhammad, and treated Sa'd ibn Abi Waqqas and Abu Bakr. When the latter was dying, he designated his illness as poisoning.
Trained in Yemen, he is reported to have written a book named Dialog in Medicine. He was also a student and teacher at the Academy of Gundishapur in Persia.
He was half brother of Abu Bakra al-Thaqafi (also known as Nufay ibn al-Harith).
Some historians maintain that he received his medical education at the Jundishapur medical school of Persia where he learnt the teachings of Aristotle and Galen.