Abu Dhabi is the capital city of the United Arab Emirates. The city is the seat of the Abu Dhabi Central Capital District, the capital city of the Emirate of Abu Dhabi, and the UAE's second-most populous city, after Dubai. The city is situated on a T-shaped island, extending into the Gulf from the central-western coast of the UAE.

Abu Dhabi is located on an island in the Persian Gulf, off the Central West Coast. Most of the city and the Emirate reside on the mainland connected to the rest of the country. As of 2023, Abu Dhabi's urban area had an estimated population of 2.5 million, out of 3.8 million in the emirate of Abu Dhabi. The Abu Dhabi Investment Authority is headquartered in the city, and was the world's 3rd largest sovereign wealth fund in 2022. Abu Dhabi itself has over a trillion US dollars worth of assets under management in a combination of various sovereign wealth funds headquartered there.

Abu Dhabi houses local and federal government offices and is the home of the United Arab Emirates Government and the Supreme Council for Financial and Economic Affairs. The city is home to the UAE's President, a member of the Al Nahyan family. Abu Dhabi's rapid development and urbanisation, coupled with the massive oil and gas reserves and production and relatively high average income, have transformed it into a large, developed metropolis. It is the country's centre of politics and industry, and a major culture and commerce center. Abu Dhabi accounts for about two-thirds of the roughly $503 billion UAE economy.