The Marsh Arabs (Arabic: Arab al-Ahwār "Arabs of the Marshlands"), also known as the Maʻdān, though the latter is often considered as a derogatory term in modern days, are inhabitants of the Tigris-Euphrates marshlands in the south and east of Iraq and along the Iranian border.

Comprising members of many different tribes and tribal confederations, such as the Āl Bū Muḥammad, Ferayghāt, Shaghanbah and Banī Lām, the Maʻdān have developed a unique culture centered on the marshes' natural resources.

Many of the marshes' inhabitants are displaced when the wetlands are drained during and after the 1991 uprisings in Iraq.