(Peter) Humphry Greenwood FRS[1] FIBiol (21 April 1927 - 3 March 1995) was an English ichthyologist. He was elected a Fellow of the Royal Society in 1985.[2][3] He was known for for his work on the species flocks of cichlids in the African Great Lakes, and for studies of the phylogeny and systematics of teleosts.[1]