The Hammerstein Ballroom is a 12,000-square-foot (1,100 m2) ballroom located within the Manhattan Center at 311 West 34th Street in Midtown Manhattan, New York City. The capacity of the ballroom is dependent on the configuration of the room; it seats 2,500 people for theatrical productions and musical performances, and several thousand for events held within a central ring. The floor of the ballroom is flat. The two main balconies – which are unusually close to the ground and gently sloped – seat a total of 1,200. The third balcony has been stripped of seats and is not used.

A ballroom or ballhall is a large room inside a building, the primary purpose of which is holding large formal parties called balls. Traditionally, most balls were held in private residences; many mansions and palaces, especially historic mansions and palaces, contain one or more ballrooms. In other large houses, a large room such as the main drawing room, long gallery, or hall may double as a ballroom, but a good ballroom should have the right type of flooring, such as hardwood flooring or stone flooring .. For most styles of modern dance, a wooden sprung floor offers the best surface.