Pierre Paul Dehérain (19 April 1830 in Paris – 7 December 1902) was a French plant physiologist and agricultural chemist.

He was notably the doctoral advisor of the Nobel Prize winner Henri Moissan.

He served as an assistant at the Conservatoire national des arts et métiers in Paris, then at the age of 26, began work as a professor at the Collège Chaptal.

He discovered respiration by plant roots and investigated the effect of different minerals on the growth of fruits.

The plant genus Deherainia from the family Theophrastaceae is named after him.