Charles Russell Orcutt or C.R. Orcutt (born 27 April 1864 in Hartland, Vermont; died in Haiti 25 August 1929) was a noted naturalist sometimes called "cactus man" because on many expeditions he found new species of cacti. He was active in the San Diego Society of Natural History, promoting the foundation of a local natural history museum, now the San Diego Natural History Museum. He edited the American Botanist (1898-1900), American Plants (1907-1910), and Western Scientist (1884-1919) and in his collecting work, made contributions to the fields of botany and malacology.