Charles Warren Bonython, AO (11 September 1916 – 2 April 2012) was an Australian conservationist, explorer, author, and chemical engineer. A keen bushwalker, he is perhaps best known for his role, spanning many years, of working towards the promotion, planning and eventual creation of the Heysen Trail. His work in conservation has been across a range of issues, but especially those connected with South Australian arid landscapes.
Bonython was born in Adelaide, South Australia, to John Lavington Bonython (later Sir John), and Constance Jean, née Warren (Lady Jean Bonython). His grandfather was Sir John Langdon Bonython. He had one brother (Kym Bonython), one sister (Katherine Downer Verco), a half-brother (John Langdon Bonython) and two half-sisters (Lady Elizabeth (Betty) Hornabrook Wilson and Ada Bray Heath). (See John Lavington Bonython#Family for more detail.)
Bonython studied chemical engineering at Adelaide University. Upon graduating with a Bachelor of Science, he accepted a position with ICI Australia Ltd. There he conducted research and management in the solar salt industry, from 1940 to 1966, and served for 20 years as manager of the salt fields at Dry Creek in Adelaide. At the age of 50 he retired from his industrial career in 1966 in order to devote his time to his many other interests.
Bonython's lifetime interests in conservation and exploration were first publicly recognised by his appointment as President, Royal Geographical Society of Australasia, South Australian Branch, in 1959.