Doha, Arabic Al-Dawḥah, city, capital of Qatar, located on the east coast of the Qatar Peninsula in the Persian Gulf. More than two-fifths of Qatar’s population lives within the city’s limits. Situated on a shallow bay indented about 3 miles (5 km), Doha has long been a locally important port. Because of offshore coral reefs and shallow waters, it handled only small vessels until the completion of its deepwater port in the 1970s.

The original quarter of the city, Al-Bidaʿ, Bida in sailor’s parlance, is at the northwest; it was probably founded by members of the Sudan tribe who emigrated from the sheikhdom of Abu Dhabi. Long a centre of pirate activity in the Persian Gulf, Doha, then a small village, was destroyed in 1867 in the war between Bahrain (which was aided by Abu Dhabi) and Qatar. In the following year the British government installed Muḥammad ibn Thānī Āl Thānī, sheikh of Doha, as the premier ruler of Qatar. He agreed to abide by the terms of the Perpetual Maritime Truce of 1853, and piracy was greatly reduced. In the late 19th century the Ottoman Empire, as suzerain of much of the Arabian Peninsula, sporadically maintained a garrison at Doha. After Qatar became a British protected state in 1916, a British political agency was maintained in the town. In late 1971 Doha became the capital of newly independent Qatar.

Long a sleepy pearling and fishing village, Doha had about 350 pearling boats at the beginning of the 20th century. The development of Japanese cultured pearls and the worldwide economic depression of the 1930s severely affected the town. The development of Qatar’s considerable oil reserves after World War II, however, led to a complete economic transformation. Qatar became an extremely prosperous country with a high per capita income and undertook the thorough modernization of its capital. Old slum sections were razed, and modern commercial and residential quarters were built. Doha’s water supply is obtained by distilling seawater. The deepwater port accommodates oceangoing vessels. The Qatar National Fishing Company, using modern motorized craft, is headquartered at the port, where a modern shrimp-packing plant also has been built.

Sites of interest include Clock Tower Square, the souk (marketplace), and Government House (1969), built on reclaimed waterfront land. Further cultural developments include the establishment of a world-class Museum of Islamic Art (2008; designed by I.M. Pei) on an island offshore. Doha International Airport is located just southeast of the city. Pop. (2004) 339,847; (2010) 521,283.