1965 visit by Pope Paul VI to the United States

The United Nations is headquartered in Midtown Manhattan, New York City, United States, and the complex has served as the official headquarters of the United Nations since its completion in 1951. It is in the Turtle Bay neighborhood of Manhattan, on 17 to 18 acres (6.9 to 7.3 ha) of grounds overlooking the East River. Its borders are First Avenue on the west, East 42nd Street to the south, East 48th Street on the north, and the East River to the east. The complex consists of several structures, including the Secretariat, Conference, and General Assembly buildings and the Dag Hammarskjöld Library. The complex was designed by a board of architects led by Wallace Harrison and built by the architectural firm Harrison & Abramovitz, with final projects developed by Oscar Niemeyer and Le Corbusier. The term Turtle Bay is occasionally used as a metonym for the UN headquarters or for the United Nations as a whole.The headquarters holds the seats of the principal organs of the UN, including the General Assembly and the Security Council, but excluding the International Court of Justice, which is seated in The Hague. The United Nations has three additional subsidiary regional headquarters, or headquarters districts. These were opened in Geneva (Switzerland) in 1946, Vienna (Austria) in 1980, and Nairobi (Kenya) in 1996. These adjunct offices help represent UN interests, facilitate diplomatic activities, and enjoy certain extraterritorial privileges, but do not contain the seats of major organs. Although it is physically situated in New York City, the land occupied by the United Nations Headquarters and the spaces of buildings that it rents are under the sole administration of the United Nations and not the U.S. government. They are technically extraterritorial through a treaty agreement with the U.S. government. However, in exchange for local police, fire protection, and other services, the United Nations agrees to acknowledge most local, state, and federal laws.None of the United Nations' 15 specialized agencies (such as UNESCO) are located at the headquarters. However, some "autonomous subsidiary organs", such as UNICEF, have their headquarters at the UNHQ.

The Japanese Peace Bell is a bell donated to the United Nations Headquarters in New York City via the United Nations Association of Japan in June 1954. It is a bonsho (a Buddhist temple bell) that is 60 centimeters in diameter, 1 meter in height, and 116 kg in weight. It was established by Chiyoji Nakagawa. Ceremonies are held at the opening of the United Nations General Assembly in September each year as well as on the International Day of Peace on September 21, when the bell is rung in honor of world peace by the Secretary General, UN executives, and other public figures.

The Capture of Turtle Bay Depot was a military raid that took place in the early American Revolutionary War on July 20, 1775. The raid was on Turtle Bay Depot, a British magazine and storehouse. On the night of July 20, 1775, a raid, conducted by the Sons of Liberty and led by Marinus Willett, John Lamb, Isaac Sears, and Alexander McDougall, attacked the Turtle Bay Depot in Manhattan, New York. The raiders also seized the British ship Asia. The Sons of Liberty then sent the stores to Boston, patriots on Lake Champlain, and Fort Ticonderoga. After the capture of Turtle Bay Depot, the patriots established Turtle Bay Redoubt, an earthwork that was located on the site that would become the Headquarters of the United Nations.

The United Nations Secretariat Building is a skyscraper within the headquarters of the United Nations in the Turtle Bay neighborhood of Manhattan in New York City. It contains the offices of the United Nations Secretariat, the executive organ of the United Nations (UN). The building, designed in the International Style, is 505 ft (154 m) tall with 39 above-ground stories. It was designed by a group of architects led by Wallace Harrison. Although the building is located within the United States, the site is under UN jurisdiction, so the building is exempt from some local regulations. The Secretariat Building is designed as a rectangular slab measuring 72 by 287 ft (22 by 87 m); it is oriented from north to south and is connected with other buildings in the UN headquarters. The wider western and eastern elevations of the facade are glass curtain walls, while the narrower northern and southern elevations are made of marble. The Secretariat Building contains 889,000 sq ft (82,600 m2) of space. The lowest stories contain press offices, staff rooms, and other functions. The Secretariat offices are placed on the upper stories, which were originally arranged in a modular layout. The building also contains various pieces of artwork. The building's style has inspired the construction of other glass curtain wall buildings in Manhattan. The design process for the United Nations headquarters formally began in February 1947, and a groundbreaking ceremony for the Secretariat Building occurred on September 14, 1948. Staff started moving into the building on August 21, 1950, and it was completed in June 1951. Within a decade, the Secretariat Building was overcrowded, prompting the UN to build additional office space in the area. The building started to deteriorate in the 1980s due to a lack of funding, which was worsened by the fact that it did not meet modern New York City building codes. UN officials considered renovating the building by the late 1990s, but the project was deferred for several years. The Secretariat Building was renovated starting in 2010, and it reopened in phases from July to December 2012.

The Speech of Sheikh Mujibur Rahman at the United Nations (Bengali: জাতিসংঘে শেখ মুজিবুর রহমানের ভাষণ) was a public speech given by Sheikh Mujibur Rahman as the prime minister of Bangladesh on 25 September 1974 at the United Nations General Assembly Hall in New York City to the member states representatives of the UN general assembly sessions. It is the first Bengali-language speech at the United Nations delivered during a period of depression and famine of the People’s' Republic of Bangladesh. The day is observed in the State of New York as Bangladeshi Immigration Day since 2019.

The United Nations General Assembly Building is part of the headquarters of the United Nations in the Turtle Bay neighborhood of Manhattan in New York City. It contains the main assembly hall of the United Nations General Assembly, the main deliberative, policymaking, and representative organ of the United Nations (UN). The building was designed by a group of architects led by Wallace Harrison. It is connected with the other buildings in the UN headquarters, including the Secretariat Building and the Dag Hammarskjöld Library. Although the building is located within the United States, the site is under UN jurisdiction, so the building is exempt from some local regulations. The General Assembly Building is a four-story structure measuring 380 by 160 ft (116 by 49 m), with concave walls to the west and east, as well as a concave roof with a dome. The building contains a lobby for journalists and the general public to the north, as well as a lobby for delegates to the south. The central portion of the General Assembly Building is the General Assembly Hall, which has a seating capacity of 1,800 and measures 165 ft (50 m) long, 115 ft (35 m) wide, and 75 ft (23 m) tall. Each delegation has six seats in the hall, which face south toward a rostrum and a paneled semicircular wall with booths. The building also contains other spaces, including a delegates' lounge and the president of the United Nations General Assembly's offices on the second floor; a meditation room on the ground floor; and various shops and conference rooms in the basement. The design process for the United Nations headquarters formally began in February 1947. The General Assembly Building was the third building to be constructed at the headquarters, after the Secretariat and Conference buildings. Construction of the General Assembly Building's steelwork began in February 1950, and the building was formally dedicated on October 10, 1952. The rapid enlargement of the United Nations prompted the UN to modify the hall's layout several times in the 1960s. The General Assembly Hall was closed for renovation from 1978 to 1979 to accommodate additional delegations. The building started to deteriorate in the 1980s due to a lack of funding, and UN officials considered renovating the complex by the late 1990s, but the project was deferred for several years. As part of a wide-ranging project that began in 2008, the General Assembly Building was renovated from 2013 to 2014.

Single Form (BH 325) is a monumental bronze sculpture by the British artist Barbara Hepworth. It is her largest work, and one of her most prominent public commissions, displayed since 1964 in a circular water feature that forms a traffic island at the Headquarters of the United Nations in New York City, outside the United Nations Secretariat Building and the Dag Hammarskjöld Library. It is also the largest artwork cast by the Morris Singer foundry. Copies of a smaller version, Single Form (Memorial) (BH 314), are on public display outside the Johns Hopkins University's Paul H. Nitze School of Advanced International Studies in Washington, D.C. and in Battersea Park in London. The version in Battersea Park was granted a Grade II* listing in January 2016.

United Nations Slavery Memorial, officially known as The Permanent Memorial at the United Nations in Honour of the Victims of Slavery and the Transatlantic Slave Trade, is an installation at the Headquarters of the United Nations in New York City intended as a permanent reminder of the long-lasting effects of slavery and the slave trade.The Slavery Memorial concept came from various resolutions adopted by the UN General Assembly including A/RES/62/122, A/RES/63/5, and the Durban Declaration.The memorial was designed by Haitian-American architect Rodney Leon, and unveiled on March 25, 2015. It includes three main elements: a large triangular sculpture with a map depicting the triangular slave trade; a prone human figure depicting those who were transported overseas enslaved; and a reflecting pool mean to honour the memory of those who died in slavery. The project was supported by the Permanent Memorial Trust Fund; the estimated cost of the project prior to its construction was 4.5 million dollars.

The Dag Hammarskjöld Library is a library on the grounds of the headquarters of the United Nations, located in the Turtle Bay/East Midtown neighborhood of Manhattan in New York City. It is connected to the Secretariat and Conference buildings through ground level and underground corridors. It is named after Dag Hammarskjöld, the second Secretary-General of the United Nations. The library was founded in 1946, and the current library building was completed in 1961. The library provides research and reference services to staff of the UN Secretariat as well as members of UN permanent missions. Additionally, the library is the main depository for United Nations documents and publications and maintains a selected collection of materials of the specialized agencies and United Nations affiliated bodies, as well as a collection of books, periodicals and other materials related to the organization's programs of activities. The library also produces a digital library of UN materials, an index to the proceedings and documentation of the major UN bodies, as well as providing research guides for finding UN-related material and information. The library also supports the network of UN libraries throughout the world by supporting collaborative information resource purchasing.

Non-Violence, also known as The Knotted Gun, is a bronze sculpture by Swedish artist Carl Fredrik Reuterswärd of an oversized Colt Python .357 Magnum revolver with its muzzle tied in a knot.

The Church Center for the United Nations is a private building founded, owned, and operated by the United Methodist Church as an interfaith space housing the offices of various religions as well as several non-governmental organizations. It is at 777 United Nations Plaza in New York City, across the street from, but not part of, the United Nations Headquarters complex. The 12-story center is most known for its first-floor Chapel at the United Nations, which has a modernist design. The chapel has long been a popular site for wedding ceremonies, especially ones between couples of different religious or national backgrounds. Other events and conferences have been held at the chapel and in the church center as well.

The Ark of Return is a memorial in New York City dedicated to the victims of the Transatlantic slave trade. It was designed by Rodney Leon, a Haitian-American architect, and installed in 2015. It is located at the Visitors' Plaza of the Headquarters of the United Nations.