Cliff Ollier (born 26 October 1931) is a geologist, geomorphologist, soil scientist, emeritus professor and honorary research fellow, at the School of Earth and Geographical Sciences University of Western Australia. He was formerly at Australian National University, University of New England, Australia, Canberra University, University of Papua New Guinea, and University of Melbourne. In the late 1950s he worked on a soil survey in the Northern and Eastern provinces of Uganda.