Damietta (Egyptian Arabic: Dumya??; also known as Damiata; or Domyat); is a port and the capital of the Damietta Governorate in Egypt; a former bishopric and present multiple Catholic titular see. It is located at the Damietta branch; a distributary of the Nile; 15 kilometres (9.3 mi) from the Mediterranean Sea; about 200 kilometres (120 mi) north of Cairo.

Damietta was also the object of the Seventh Crusade; led by Louis IX of France. His fleet arrived there in 1249 and quickly captured the fort; which he refused to hand over to the nominal king of Jerusalem; to whom it had been promised during the Fifth Crusade. However; having been taken prisoner with his army in April 1250; Louis was obliged to surrender Damietta as ransom.