Paul Christoph Hennings (November 27, 1841 – October 14, 1908) was a German mycologist and herbarium curator. He discovered the study of cryptogams and mushrooms as a volunteer at the botanical garden. Although circumstances initially prevented him to study in that area, he later returned to natural sciences and eventually rose to a position at the largest herbarium in Germany. Originally interested in all non-higher plants, he specialised into mushrooms and became particularly versed in tropical species sent from abroad.