Reginald Claude Sprigg, AO FTSE (1 March 1919 – 2 December 1994) was an Australian geologist and conservationist. At 17 he became the youngest Fellow of the Royal Society of South Australia. During 1946, in the Ediacara Hills, South Australia he discovered the Ediacara biota, an assemblage of some of the most ancient animal fossils known. He was involved with oceanographic research and petroleum exploration by various companies that he initiated. In 1968, he acquired a derelict pastoral lease, Arkaroola, and transformed it into a wildlife sanctuary and wilderness reserve.