The Istana Nurul Iman palace is the official residence of the Sultan of Brunei, Hassanal Bolkiah. The palace is located on a leafy, riverside sprawl of hills on the banks of the Brunei River directly south of Brunei's capital, Bandar Seri Begawan, no more than a few miles outside the city centre. Its name is taken from Arabic, meaning Palace of the Light of Faith. It is the largest residential palace in the world and the world's largest residence of any type. The palace is hidden from public view through artful landscaping but satellite views of the palace's layout have revealed the existence of two large buildings in the centre of the palace and five smaller buildings adjacent to the palace centre.

Istana Nurul Iman contains 1,788 rooms, 257 bathrooms, and a floor area of 2,152,782 square feet (200,000 m²). Amenities include 5 swimming pools, and an air conditioned stable for the Sultan's 200 polo ponies, a 110-car garage, a banquet hall that can be expanded to accommodate up to 4,000 guests, and a mosque accommodating 1,500 people. The palace was built in 1984 at a cost of around $1.4 billion USD and has 564 chandeliers, 51,000 light bulbs, 44 stairwells, and 18 elevators. It is also a home to a car collection that includes custom-made Ferraris and Bentleys as well as 165 Rolls-Royces. Its golden and vaulted roofs echo Islamic and Malay architectural influences.

The palace is used for all State functions. It is both the seat of Brunei's government and the location of the prime minister's office. In addition to Audience and State Rooms, there is a Throne Chamber used for various occasions such as the proclamation of the Crown Prince and the annual Birthday Investiture. The palace is not open to the public except on the annual Islamic celebration of Hari Raya Aidilfitri (the festival at the end of the Muslim fasting month) when the palace receives about 110,000 visitors over a three-day period where they receive compliments such as food for visiting as well as green packets containing money for young children. The palace is also open to Muslims during the Ramadhan period for 10 days for the Bertedarus prayer gathering.