Erich Maren Schlaikjer (; 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.
Erich attended Harvard University, where he graduated with a bachelor's degree in 1929.
He received master’s and doctoral degrees from Columbia University in 1931 and in 1935, respectively.