Royal Eason Ingersoll (1883–1976) was a United States Navy four-star admiral who served as Commander in Chief, U.S. Atlantic Fleet (CINCLANT) from January 1, 1942 to late1944; Commander, Western Sea Frontier from late 1944 to 1946; and Deputy Commander in Chief, U.S. Fleet/Deputy Chief of Naval Operations (DCOMINCH/DCNO) from late 1944 to late 1945.