Bosaso (Somali: Boosaaso, Arabic: بوساسو‎) is a city in northern Somalia, which serves as the nation's main port. Situated on the southern coast of the Gulf of Aden, it is the commercial capital of the Bari region (gobolka) in the autonomous Puntland state.

Formerly known as Bandar Qasim, the city's population is estimated at about 433,471 residents. While Bosaso is a melting pot, with residents hailing from all the major clans of Somalia, most of its population is from the Harti confederation of Darod sub-clans. The city is relatively peaceful in comparison to the southern parts of Somalia.

The Periplus of the Erythraean Sea indicates that ancient Greek merchants sailed to Bosaso, providing notes about the strategic and geographical location of the current Bosaso area, which was known as Mosylon in ancient times.

Bosaso was previously known as Bandar Qasim, a name derived from a Somali trader of the same name who is said to have first settled in the area during the 14th century. It is believed that Qasim's favourite camel was called Boosaas, from which derived the current name of the town. The town was thus first called Bandar Qassim after its founder ("Qasim's town"), then later dubbed Bosaso after its founder's trusted camel. This story is, however, purely speculative. Historically, Bosaso has been a Harti Darod stronghold, and evolved as a coastal outpost of their Sultanates.