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William Daniel Leahy (/ˈleɪhi, ˈleɪ.i/; 6 May 1875 – 20 July 1959) was an American naval officer. The most senior United States military officer on active duty during World War II, he held several titles and exercised considerable influence over foreign and military policy. As a fleet admiral, he was the first flag officer ever to hold a five-star rank in the U.S. Armed Forces.

An 1897 graduate of Annapolis, Leahy saw active service in the Spanish–American War, the Philippine Insurrection, the Boxer Rebellion in China, the Banana Wars in Central America, and World War I. He was the first member of his cadet class to reach flag rank, as the Chief of the Bureau of Ordnance from 1927 to 1931. He subsequently served as Chief of the Bureau of Navigation from 1933 to 1936, and commanded the Battle Fleet from 1936 to 1937. As Chief of Naval Operations from 1937 to 1939, he was the senior officer in the United States Navy, overseeing the expansion of the fleet and preparations for war.

After retiring from the Navy, Leahy was appointed the governor of Puerto Rico in 1939 by President Franklin D. Roosevelt. In his most controversial role, he served as the Ambassador to France from 1940 to 1942. American policy was aimed at keeping the government of Vichy France free of German control, but Leahy had limited success. He came to believe that the United States should back Free France instead of Vichy France, and asked to be recalled after the Japanese attack on Pearl Harbor brought the United States into the war. Leahy was subsequently recalled to active duty as the Chief of Staff to the President in 1942 and served in that position for the rest of the Second World War. As the de facto first Chairman of the Joint Chiefs of Staff, he oversaw all of the American armed forces and was a major decision-maker during the war. He also presided over the American delegation to the Combined Chiefs of Staff. In December 1944, Leahy was promoted to five-star rank of fleet admiral.

In the aftermath of World War II, Leahy served Roosevelt's successor Harry S. Truman, helping shape postwar foreign policy until he retired in 1949. Although he did not oppose the use of the nuclear weapons during the war, in the post-war period he rejected war plans that placed too much emphasis on the first use of nuclear weapons.