Erich Maren Schlaikjer (/ˈɛrɪk ˈmærɛn ˈʃlaɪ.kjər/ November 22, 1905 in Newtown, Ohio – November 5, 1972) was an American geologist and dinosaur hunter. Assisting Barnum Brown, he co-described Pachycephalosaurus and what is now Montanoceratops. Other discoveries include Miotapirus and a new species of Mesohippus.