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.[1]