Charles Rowland Twidale is an Australian geomorphologist active at the University of Adelaide.
[1] Twidale's research has covered varied subjects including structural geomorphology, weathering, ancient landscapes in shield regions, granite landforms in deserts, paleosurfaces and the history of geomorphology.
[2] Twidale has been most active investigating the geomorphology of Australia, Spain and southwestern United States.
In 1976 C. R. Twidale was president of the Royal Society of South Australia.
[3] In 1993 he was awarded the Mueller Medal by the Australian and New Zealand Association for the Advancement of Science.