Robert Devore McWethy (January 5, 1920 – January 29, 2018) was a United States Navy captain and submariner who fought in the Pacific during World War II and later pioneered submarine navigation under the Arctic ice pack. Capt McWethy received the Legion of Merit for his role in the development of SOSUS underwater listening posts as commander of Oceanographic Systems Atlantic. From the 1970s on he was also active in support of sailing in the navy and at the U.S. Naval Academy.