The Battle of Red Bank, also known as the Battle of Fort Mercer, was fought on October 22, 1777, during the American Revolutionary War. A British and Hessian force was sent to take Fort Mercer on the New Jersey side of the Delaware River just south of Philadelphia, but was decisively defeated by a smaller force of Continental Army troops.

Fort Mercer was an earthen fort on the eastern shores of the Delaware River in New Jersey that was constructed by the Continental Army during the American Revolutionary War. The fort was built in 1777 by Polish engineer Thaddeus Kosciuszko under the command of George Washington. Along with Fort Mifflin on the Pennsylvania side of the Delaware River to its west, Fort Mercer was designed to block the British advance on the revolutionary capital of Philadelphia during the Philadelphia campaign.