Duncan Chessell (born 1970 in Adelaide) is an Australian explorer, mountain guide, geologist and photographer who has reached the seven highest summits in each of the world's seven continents.
In 2006, Chessell worked with a group of young people with cancer, known as CanTeen, guiding them to climb Mt Kilimanjaro.
Other destinations included the Kokoda Track in Papua New Guinea, which his company DCXP guided thousands of Australian trekkers over between 2003 and 2010.
In 2010, Chessell sold DCXP, and shifted back into the field of geology and became the managing director of the public mineral exploration company Endeavour Discoveries Ltd (2010-2016).
In 2014, Chessell was founding chairman of the Himalayan Development Foundation Australia Inc (HDFA) an organisation dedicated to the helping children in a Nepal get a start in life via education.