Friedrich Wilhelm Hermann Delffs (21 April 1812 in Kiel – 18 March 1894 in Heidelberg) was a German chemist.
He studied natural sciences at the University of Kiel, receiving his doctorate in 1834.
At Heidelberg he gave classes in pharmaceutical, organic and physiological chemistry.
[1][2] He main research dealt with investigations of uric acid, fumaric acid, oenanthic ether, sorbin, laurin, molybdate of ammonia and alloxan.
[1][3] In 1843, with mineralogist Johann Reinhard Blum, he proposed the name "leonhardite" for partially dehydrated forms of laumontite.