The Battle of Baltimore (September 12–15, 1814) was a sea/land battle fought between British invaders and American defenders in the War of 1812. American forces repulsed sea and land invasions off the busy port city of Baltimore, Maryland, and killed the commander of the invading British forces. The British and Americans first met at the Battle of North Point. Though the Americans retreated, the battle was a successful delaying action that inflicted heavy casualties on the British, halted their advance, and consequently allowed the defenders at Baltimore to prepare for an attack properly.

The resistance of Baltimore's Fort McHenry during bombardment by the Royal Navy inspired Francis Scott Key to compose the poem "Defence of Fort McHenry," which later became the lyrics for "The Star-Spangled Banner," the national anthem of the United States.

Future US President James Buchanan served as a private in the defense of Baltimore.