The Sea Wall is a unique defensive structure found only on the "Walls of Constantinople" level of the Attila the Hun campaign in Age of Empires II. It also appears in the final Attila the Hun mission in the game, together with its counterpart, the Sea Gate. It is very similar in appearance to Palisade Wall. It is found to the north of Constantinople, in the harbour, and defends the city from seafaring vessels.

The Sea Wall is not available in the Scenario Editor by default, but can be unlocked using GenieEd or another DAT editor.