Steven Carruthers is an Australian naval historian and former Royal Australian Navy radar plotter. For more than four decades he has researched the Japanese submarine campaign against Australia during the Second World War, with particular focus on the 1942 attack on Sydney Harbour and the wider East Coast sea war. His work draws on archival research, wartime records, and collaboration with maritime archaeologists and divers involved in the discovery and documentation of Japanese midget submarine M24. Carruthers is the author of several books on Australia's wartime maritime history and continues to write and lecture on the subject.