Frank Knox, American publisher and politician, 46th United States Secretary of the Navy (d. 1944)
William Franklin Knox (January 1, 1874 – April 28, 1944) was an American politician, newspaper editor and publisher. He was also the Republican vice presidential candidate in 1936, and Secretary of the Navy under Franklin D. Roosevelt during most of World War II. On December 7, 1941, Knox flanked by his assistant John O’Keefe walked into Roosevelt's White House study at approximately 1:30 p.m. EST announcing that Japan had attacked Pearl Harbor. Knox was mentioned by name in Adolf Hitler's speech of December 11, 1941, in which Hitler asked for a German declaration of war against the United States.

Born in Boston, he attended Alma College and served with the Rough Riders during the Spanish–American War. After the war, he became a newspaper editor in Grand Rapids, Michigan and a prominent supporter of the Republican Party. He advocated U.S. entrance into World War I and served as an artillery officer in France. The 1936 Republican National Convention nominated a ticket of Alf Landon and Knox, and they were defeated by Roosevelt and John Nance Garner in the 1936 election.

After World War II broke out, Knox supported aid to the Allies. In 1940, Roosevelt appointed him as Secretary of the Navy in hopes of building bipartisan support. He presided over a naval buildup and pushed for the internment of Japanese Americans. Knox served as Secretary of the Navy until his death in 1944.