Banaadir (Somali: Banaadir, Arabic: بنادر, Italian: Benadir) is an administrative region (gobol) in southeastern Somalia. It covers the same area as the city of Mogadishu, which serves as the capital. It is the only region in the country not belonging to any of the seven states. It is bordered to the northwest by the Shabelle river and to the southeast by the Indian Ocean.

The territorial extent and scope of the term Benaadir has varied in definition throughout its history, with medieval usage extending Benaadir to huge swaths of coast adjacent to Mogadishu stretching as far as hundreds of miles, from Hobyo in the north. The early modern period which extended the meaning of Benaadir to the interior midway towards the Hirshabelle region, to the contemporary period wherein sometimes the nonstandard misnomer of usage being interchangeable with the city of Mogadishu. This Banaadir municipality is bordered to the north by Hirshabelle and to the southwest by South West, and is the only Somali gobol (administrative region) which is both a municipality and a gobol known as a region.

The Banaadir region is bordered by the Middle Shebelle (Shabeellaha Dhexe) and Lower Shebelle (Shabeellaha Hoose), as well as the Indian Ocean.

"Benaadir" is derived from the Somali banaadir, which means "coast", in reference to the southern Somali coastal cities Mogadishu, Merka and Barawa. The place name reflects the region's medieval position as a key trade center with Persia, Arabian Peninsula and the Swahili coast.

The name derives from the Persian bandar (بندر) meaning ‘port’ or ‘harbour’.

Its capital is Mogadishu, known locally as Xamar (pronounced: Hamar), although the administrative region itself is coextensive with the city. Banaadir is much smaller than the historical region of Benadir, which covered most of the country's central and southern seaboard opposite the Indian Ocean and up to the Juba River, including Mogadishu.

Thabit M. Abdi was appointed mayor of Mogadishu and governor of Banaadir in 2017, succeeding Yusuf Hussein Jimale who held that post since November 2015.

Tradition and old records assert that southern Somalia, including the Mogadishu area, was inhabited by Benadiris for centuries and was during the early modern period considered the wealthiest city on the East African coast, as well as the center of a thriving textile industry. In the 17th century, Mogadishu and parts of southern Somalia fell under the Hiraab Imamate and in the 19th century came under the Geledi Sultanate's sphere of influence.