Alf Ottar Brubakk (24 January 1941 – 5 April 2022) was a Norwegian researcher and professor at the Faculty of Medicine and Health Sciences Department of Circulation and Imaging (ISB) of the Norwegian University of Science and Technology (Norwegian: Norges teknisk-naturvitenskapelige universitet) in Trondheim, Norway. He worked in the physiology of underwater diving, particularly decompression, was an advisor on diving physiology to the offshore diving industry, and a president of the European Underwater and Baromedical Society.[1][2][3]