Pierre Borel (Latin: Petrus Borellius; c. 1620 – 1671) was a French chemist, alchemist, physician, and botanist.

In 1654, he became physician to the King of France, Louis XIV.

[1] In 1663, he married Esther de Bonnafous.

[1] He concerned himself with an eclectic range of subjects such as optics, ancient history, philology, and bibliography.

Borel appears in the novel The Case of Charles Dexter Ward by H. P. Lovecraft, where he is represented as a necromancer.