William Beanes (January 24, 1749 – October 12, 1828) was an American physician who became indirectly responsible for the writing of the national anthem of the United States. Beanes was a Maryland resident, and upon the British invasion of Maryland during the War of 1812 offered British commanders the use of his home. However, Beanes arrested British deserters who had taken to ransacking local farms in search of food, an act which led to his arrest and detention by the British.