The Battle of Hatteras Inlet Batteries (August 28–29, 1861) was the first combined operation of the Union Army and Navy in the American Civil War, resulting in Union domination of the strategically important North Carolina Sounds. Two forts on the Outer Banks, Fort Clark and Fort Hatteras, had been built by the Confederates to protect their commerce-raiding activity. These were lightly defended, however, and their artillery could not engage the bombarding fleet under Flag Officer Silas H. Stringham, commandant of the Atlantic Blockading Squadron, which had been ordered to keep moving, to avoid presenting a static target. Although held up by bad weather, the fleet was able to land troops under General Benjamin Butler, who took the surrender of Flag Officer Samuel Barron.

This battle represented the first application of the naval blockading strategy. The Union retained both forts, providing valuable access to the sounds, and commerce raiding was much reduced. The victory was welcomed by a demoralized Northern public after the humiliating First Battle of Bull Run. The engagement is sometimes known as the Battle of Forts Hatteras and Clark.