Alfred Eisenack (born 13 May 1891 in Altfelde, West Prussia, died 19 April 1982 in Reutlingen) was a German paleontologist. He was a pioneer of micropaleontology and palynology. His botanical and mycological author abbreviation is "Eisenack". Eisenack took his photographs using a Leitz monocular microscope, to which he attached a box camera fashioned from a biscuit tin and furnished with glass negatives.He first described chitinozoans and many species of acritarchs, dinoflagellate cysts and graptolites.In 1973 he became an honorary member of the Paleontological Society.