Donald Finlay Fergusson Thomson, OBE (26 June 1901 – 12 May 1970) was an Australian anthropologist and ornithologist who was largely responsible for turning the Caledon Bay crisis into a "decisive moment in the history of Aboriginal-European relations". He is remembered as a friend of the Yolngu people, and as a champion of understanding, by non-Indigenous Australians, of the culture and society of Indigenous Australians.