Megaloceros (from Greek: μεγαλος, megalos + κερας, keras, literally "Great Horn"; see also Lister [1987]) is an extinct genus of deer whose members lived throughout Eurasia from the late Pliocene to the Late Pleistocene and were important herbivores during the Ice Ages. The largest species, Megaloceros giganteus, vernacularly known as the "Irish Elk" or "Giant elk", is also the best known. Although sometimes synonymized with Megaloceros, Praemegaceros and Megaceroides are apparently generically distinct.