Adolf Hoel (15 May 1879 – 19 February 1964) was a Norwegian geologist, environmentalist and Polar region researcher. He led several scientific expeditions to Svalbard and Greenland. Hoel has been described as one of the most iconic and influential figures in Norwegian polar exploration in the first half of the 20th century, alongside Fridtjof Nansen and Roald Amundsen. His focus on and research of the polar areas has been largely credited as the reason Norway has sovereignty over Svalbard and Queen Maud Land in the Antarctica.
Hoel was the founding director of the Norwegian Polar Institute and served as rector of the University of Oslo and as President of the Norwegian Society for the Conservation of Nature.