Secretariat Building, Brunei

The Ministry of Home Affairs (MOHA; Malay: Kementerian Hal Ehwal Dalam Negeri, KHEDN) is a cabinet-level ministry in the government of Brunei which is responsible for the country's administrative divisions, municipal areas, immigration, labour, fire and rescue services, prison and rehabilitation institutions, and national disaster management. It was established immediately upon Brunei's independence on 1 January 1984. It is currently led by a minister and the incumbent is Ahmaddin Rahman, who took office since 7 June 2022. The ministry is headquartered in Bandar Seri Begawan.

Bandar Seri Begawan (BSB; Jawi: بندر سري بڬاوان; Malay: [ˌbandar səˌri bəˈɡawan] ) is the capital and largest city of Brunei. It is officially a municipal area (kawasan bandaran) with an area of 100.36 square kilometres (38.75 sq mi) and an estimated population of 100,700 as of 2007. It is part of Brunei-Muara District, the smallest yet most populous district which is home to over 70 per cent of the country's population. It is the country's largest urban centre and nominally the country's only city. The capital is home to Brunei's seat of government, as well as a commercial and cultural centre. It was formerly known as Brunei Town until it was renamed in 1970 in honour of Sultan Omar Ali Saifuddien III, the 28th Sultan of Brunei and the father of the current Sultan Hassanal Bolkiah. The history of Bandar Seri Begawan can be traced back to the establishment of a Malay stilt settlement on the waters of the Brunei River which became the predecessor of Kampong Ayer today. It became the capital of the Bruneian Sultanate from the 16th century onwards, as well as in the 19th century when it became a British protectorate. The establishment of a British Residency in the 20th century saw the establishment of modern-day administration on land, as well as the gradual resettlement of the riverine dwellers to the land. During World War II, the capital was occupied by the Japanese forces from 1941 and bombed in 1945 upon liberation by Allied forces. Brunei's independence from the British was declared on 1 January 1984 on a square in the city centre. Bandar Seri Begawan is home to Istana Nurul Iman, the largest residential palace in the world by the Guinness World Records, and Omar Ali Saifuddien Mosque, Brunei's iconic landmark. It is also home to Kampong Ayer, the largest 'water village' in the world and nicknamed Venice of the East. It was once the host city of the 20th Southeast Asian Games in 1999 and 8th APEC Summit in 2000.

Pusat Bandar (English: City Centre) is the city centre of Bandar Seri Begawan, the capital of Brunei. It is home to a number of national landmarks, important government offices, and commercial and financial establishments.

The Old Lapau (Malay: Lapau Lama), formerly known as the Lapau, is a historical building in Bandar Seri Begawan, Brunei. It was the former lapau or royal ceremonial hall prior to the existence of the current Lapau building. It was also where the Constitution of Brunei was promulgated in 1959. It now houses a museum pertaining to the Constitution.

The Brunei Postal Services Department (Malay: Jabatan Perkhidmatan Pos) is a government department which is responsible for providing postal service in Brunei.

The Dewan Bahasa dan Pustaka Library (Malay: Perpustakaan Dewan Bahasa dan Pustaka) or simply Dewan Bahasa Pustaka Library, is a public library located in Pusat Bandar of Bandar Seri Begawan, was initiated in 1965 and completed in 1968. Designed in the Constructivist architecture, the building serves as a hub for educational and literary resources, with its primary function as a library and educational centre. Today, it offer a range of materials, services, and programs that are easily accessible and free of charge to all residents.

Taman Haji Sir Muda Omar 'Ali Saifuddien is a historical urban park, located in the Pusat Bandar of Bandar Seri Begawan, where significant state ceremonies are held, including the Sultan's birthday celebrations, National Day, the National Musabaqah Al-Quran, and the birthday of Prophet Muhammad, among others. Formerly known as Padang Besar, the park underwent renovations in 1983 and was renamed in honour of Sultan Omar Ali Saifuddien III. This site holds historical importance, as it was the location of Brunei's declaration of independence reading on 1 January 1984. Taman Haji Sir Muda Omar 'Ali Saifuddien is located across from the Omar Ali Saifuddien Mosque in the capital of Brunei. Other notable buildings surrounding the field include the Secretariat Building and the Community Hall.

The Brunei History Centre (PSB; Malay: Pusat Sejarah Brunei) is a government institution which conducts research, documentation, publication and dissemination on matters pertaining to the history of Brunei. It was established in 1982 by the consent of Sultan Hassanal Bolkiah as an institute of historical research on Brunei for the benefit of the Bruneian people. The head of Brunei History Centre is a Principal (Malay: Pengetua), which was held by Mohd. Jamil Al-Sufri until his death on 4 March 2021. The current Principal of Brunei History Centre is Dr. Hadi bin Melayong, another well known historian and long time deputy and acting Principal of Brunei History Centre. It is a government department under the Ministry of Culture, Youth and Sports.

The Raja Ayang Mausoleum (Malay: Makam Raja Ayang) is a historical mausoleum in Bandar Seri Begawan, Brunei. It believed to honour a royal punished for incest in the 15th century, became a site of cultural significance where visitors seek blessings despite the resulting damage from offerings. Renovated in 2008 with a dome structure, it preserves Brunei's history while safeguarding the tomb from further deterioration.

Radio Television Brunei (Malay: Radio Televisyen Brunei, Jawi: راديو تيليۏيشين بروني, officially abbreviated as RTB) is the national public broadcaster of Brunei. Radio Brunei made its first broadcast on 2 May 1957, with a television service starting on 1 March 1975. RTB monopolises the free-to-air television in the country, and also radio until 1999, when the country's only commercial radio station, Kristal FM was founded. Currently, it operates 3 television channels and 5 radio stations. The network's logo was based from the national emblem of Brunei.

The PGGMB Building was constructed in 2003, is the third tallest building in Brunei after The DST Group Building. The Building was listed as the sixth tallest Building in Borneo just about 295 feet high.

Bank Islam Brunei Darussalam (BIBD) is the main Islamic financial institution and the largest bank in Brunei. With the biggest network of branches and ATMs strategically placed throughout Brunei's four districts, BIBD has its headquarters situated in Bandar Seri Begawan.