阿杜环礁是马尔代夫的环礁，位于印度洋海域，是该国最南面的环礁，由23座岛屿组成，土地面积9.41平方公里，潟湖面积76.71平方公里，潟湖最大水深78.6米，人口28,000。

Addu Atoll, previously also known as Seenu Atoll, is the southernmost atoll of the Maldives. Addu Atoll, together with Fuvahmulah, located 52.3 km north of Addu Atoll, extend the Maldives into the Southern Hemisphere. Addu Atoll is located 541 km south of Malé. Administratively, Addu Atoll is the site of Addu City, one of the two cities of Maldives. Addu City is constituted of the inhabited areas of Addu Atoll, namely the natural islands of Hulhudhoo, Meedhoo, Maradhoo, Feydhoo, and Hithadhoo. (The districts of Addu City are not according to the natural islands that it comprises). In addition to the areas that are included as a part of Addu City, Addu Atoll has a number of uninhabited islands, including the island of Gan, where Gan International Airport is located.