Equestrian statue of George Washington (New York City)

Union Square is a historic intersection and surrounding neighborhood in Manhattan, New York City, located where Broadway and the former Bowery Road – now Fourth Avenue – came together in the early 19th century. Its name denotes that "here was the union of the two principal thoroughfares of the island". The current Union Square Park is bounded by 14th Street on the south, 17th Street on the north, and Union Square West and Union Square East to the west and east respectively. 17th Street links together Broadway and Park Avenue South on the north end of the park, while Union Square East connects Park Avenue South to Fourth Avenue and the continuation of Broadway on the park's south side. The park is maintained by the New York City Department of Parks and Recreation. Adjacent neighborhoods are the Flatiron District to the north, Chelsea to the west, Greenwich Village to the southwest, East Village to the southeast, and Gramercy Park to the east. Many buildings of The New School are near the square, as are several dormitories of New York University. The eastern side of the square is dominated by the four Zeckendorf Towers, and the south side by the full-square-block mixed-use One Union Square South, which contains a wall sculpture and digital clock titled Metronome. Union Square Park also contains an assortment of art, including statues of George Washington, Marquis de Lafayette, Abraham Lincoln, and Mahatma Gandhi. Union Square is part of Manhattan Community District 5 and its primary ZIP Code is 10003. It is patrolled by the 13th Precinct of the New York City Police Department. The New York City Subway's 14th Street–Union Square station, served by the 4, ​5, ​6, <6>​, L​, N, ​Q, ​R, and ​W trains, is located under Union Square.

USS Recruit, also known as the Landship Recruit, was a wooden mockup of a dreadnought battleship constructed by the United States Navy in Manhattan in New York City, as a recruiting tool and training ship during the First World War. Commissioned as if it were a normal vessel of the U.S. Navy and manned by a crew of trainee sailors, Recruit was located in Union Square from 1917 until the end of the war. In 1920, with the reduced requirements for manning in the post-war Navy, Recruit was decommissioned and dismantled, having recruited 25,000 sailors into Navy service.

On August 4, 2023, at approximately 3:30 p.m. EDT, internet personality Kai Cenat held a purported giveaway of gaming-related items in Union Square, Manhattan, while not having a permit for the gathering. The event, which drew thousands of participants to Union Square Park, became a riot. Social media posts of the event surfaced around the same time. Cenat was taken into police custody by the New York City Police Department (NYPD) during the riot and was charged with inciting a riot and unlawful assembly. He appeared in court on August 16 and August 18. His business partners at Any Means Possible apologized for the riot. Cenat would also apologize in a livestream on August 9. The incident led to discussion and debate about the influence of internet personalities.

A statue of Mahatma Gandhi by Kantilal B. Patel stands in Union Square in Manhattan, New York, United States.

Independence Flagstaff, also known as the Charles F. Murphy Memorial Flagpole, is an outdoor memorial by sculptor Anthony de Francisci, located in Union Square Park in Manhattan, New York, which commemorates the 150th anniversary of the signing of the United States Declaration of Independence. The memorial was cast in 1926 and dedicated on July 4, 1930. It was made of steel, with copper sheathing, and is set on a granite pedestal which includes bronze bas-reliefs and plaques. The monument is in axial alignment with Henry Kirke Brown's statues of George Washington and Abraham Lincoln.

Union Square Drinking Fountain, also known as James Fountain, is an outdoor bronze sculpture and ornamental fountain by sculptor Adolf von Donndorf and architect J. Leonard Corning, located on the west side of Union Square Park in Manhattan, New York City. Cast in 1881 and dedicated on October 25, 1881, it was donated by Daniel Willis James "to promote public health as well as the virtue of charity". The statuary group includes a standing woman holding a baby in her right arm and a young child at her left side. They are set on an octagonal Swedish red granite pedestal with lion head fountains and basins on four of the sides.

The 14th Street–Union Square station is a New York City Subway station complex shared by the BMT Broadway Line, the BMT Canarsie Line and the IRT Lexington Avenue Line. It is located at the intersection of Fourth Avenue and 14th Street, underneath Union Square in Manhattan. The complex sits on the border of several neighborhoods, including the East Village to the southeast, Greenwich Village to the south and southwest, Chelsea to the northwest, and both the Flatiron District and Gramercy Park to the north and northeast. The 14th Street–Union Square station is served by the 4, 6, L, N, and Q trains at all times; the 5 and R trains at all times except late nights; the W train on weekdays; and ⟨6⟩ train weekdays in the peak direction. The Lexington Avenue Line platforms were built for the Interborough Rapid Transit Company (IRT) as an express station on the city's first subway line, which was approved in 1900. The station opened on October 27, 1904, as one of the original 28 stations of the New York City Subway. As part of the Dual Contracts, the Broadway Line platforms opened in 1917 and the Canarsie Line platform opened in 1924. Several modifications have been made to the stations over the years, and they were combined on July 1, 1948. The complex was renovated in the 1990s and was placed on the National Register of Historic Places in 2005. The Lexington Avenue Line station has two abandoned side platforms, two island platforms, and four tracks, while the parallel Broadway Line station has two island platforms and four tracks. The Canarsie Line station, crossing under both of the other stations, has one island platform and two tracks. Numerous elevators make most of the complex compliant with the Americans with Disabilities Act of 1990 (ADA). The Lexington Avenue Line station, serving the 4, ​5, ​6, and <6> trains, is not ADA-accessible. In 2016, over 34 million passengers entered this station, making it the fourth-busiest station in the system.

Marquis de Lafayette is an outdoor bronze sculpture of Gilbert du Motier, Marquis de Lafayette by artist Frédéric Auguste Bartholdi, located at Union Square Park in Manhattan, New York.

An outdoor bronze statue of Abraham Lincoln by Henry Kirke Brown is installed in Union Square in Manhattan, New York.

The Spingler Building (also Springler Building or 5 Union Square West) is an eight-story Romanesque building at 5–9 Union Square West, between 14th and 15th Streets, in the Union Square neighborhood of Manhattan, New York City. Built in 1897 by William H. Hume & Son, it replaced a five-story building of the same name, which burned down in 1892. The Spingler Building occupies an L-shaped lot wrapping around 15 Union Square West to the north, and is also adjacent to the Lincoln Building to the south.

Metronome is a large public art installation located along the south end of Union Square in New York City. The work was commissioned by the Related Companies, developers of One Union Square South, with the participation of the Public Art Fund and the Municipal Art Society. The $4.2 million provided by the developer makes it one of the largest private commissions of public art. The artwork was created by Kristin Jones and Andrew Ginzel and consists of several sections, including a round circular void from which puffs of white steam were at one point released throughout the day, and a clock made of large orange LED digits. Installation of Metronome began in February 1999, and its dedication took place on October 26, 1999.

15 Union Square West is a residential building on East 15th Street overlooking Union Square in Manhattan, New York City. Originally Tiffany & Company’s 19th-century headquarters, it was refurbished and reopened in 2008 as high-end apartments. Commissioned by Charles Lewis Tiffany in 1869, John Kellum designed the original structure, which included 16-foot cast-iron arches that rose above the park. The building cost $500,000 and opened in 1870. At the time, the store was described as “the largest of its kind devoted to this business of any in the world,” and dubbed the “palace of jewels”. Tiffany & Co. stayed there until 1906. By 1925 the building was occupied by the Amalgamated Clothing Workers of America trade union. By 1952 it was owned by Amalgamated Bank. After a fatal accident where a pedestrian was struck by a falling piece of cast iron, they stripped the original façade and covered it with white brick. The building then stood unchanged for more than 50 years.Brack Capital Real Estate purchased the property in 2006, and restored the original six-story structure and added six newly constructed floors to create a boutique condominium with 36 residences. The brick façade was dismantled and the original arches were reconditioned and wrapped behind a façade of glass and black anodized aluminum. The original structure was topped by an additional six stories of all glass residences. Designed by Eran Chen of ODA-Architecture, previously of Perkins Eastman, the building blends historic and contemporary elements.In 2011, two of the two-bedroom apartments were purchased by tennis player Caroline Wozniacki for $9 million. Earlier that year, the retail portion of the development was purchased by the State Teachers Retirement System of Ohio (STRS) for $57.88 million.