The Vivian Beaumont Theater is a Broadway theater in the Lincoln Center complex at 150 West 65th Street on the Upper West Side of Manhattan in New York City, New York, U.S. Operated by the nonprofit Lincoln Center Theater (LCT), the Beaumont is the only Broadway theater outside the Theater District that surrounds Times Square. Named after heiress and actress Vivian Beaumont Allen, the theater was one of the last structures designed by modernist architect Eero Saarinen. Broadway scenic designer Jo Mielziner oversaw the design of the interior. The theater shares a building with the New York Public Library for the Performing Arts and contains two off-Broadway venues, the Mitzi E. Newhouse Theater and the Claire Tow Theater.

The Beaumont occupies the southern and western sides of its building's first and second floors, while the library wraps above and on top of it. The main facade faces Lincoln Center's plaza and is made of glass and steel, with a travertine attic above. The main auditorium has approximately 1,080 seats across two levels, arranged in a steeply sloped semicircular layout. The Beaumont differs from traditional Broadway theaters because of its use of a flexible stage, which could be extended with a thrust stage of varying length. The layout led to complaints about inferior sightlines and acoustics in the theater's early years. The 299-seat Mitzi E. Newhouse Theater is in the basement and the 112-seat Claire Tow Theater is on the roof.

Allen donated $3 million for the theater's construction in 1958 but died before its completion. The Beaumont opened on October 21, 1965, and was originally operated by Jules Irving and Herbert Blau of the Repertory Theater of Lincoln Center, generally presenting four shows a season. The Beaumont was managed by the New York Shakespeare Festival, under the direction of Joseph Papp, from 1973 to 1977. Richmond Crinkley took over the theater for the next eight years, with the Beaumont only operating for two seasons during that time. Controversies over the Beaumont's operation, a proposed renovation, and financial difficulties led to LCT being reorganized in 1985, with Gregory Mosher and Bernard Gersten taking over as the new Director and Executive Producer. The Beaumont became much more successful and was renovated in 1996. The theater has hosted several popular productions since the late 1980s, including Anything Goes, Contact, The Light in the Piazza, South Pacific, The King and I, and My Fair Lady.

The Vivian Beaumont Theater was designed by Finnish American architect Eero Saarinen, with Broadway scenic designer Jo Mielziner overseeing the design of the interior. It is part of Lincoln Center, a performing arts complex on the Upper West Side of Manhattan in New York City, New York, U.S. The Beaumont is in the same building as the New York Public Library (NYPL)'s Performing Arts Library, designed by Gordon Bunshaft of Skidmore, Owings & Merrill (SOM). Various contractors were also involved in the Beaumont's construction, including general contractor Turner Construction, acoustical engineer Bolt Beranek & Newman, structural engineer Ammann & Whitney and mechanical engineer Syska Hennessy.

The library–theater building is on the western side of Paul Milstein Pool and Terrace, the elevated plaza at the middle of Lincoln Center, just south of 65th Street. The plaza contains a reflecting pool at its center, measuring around 80 ft (24 m) wide and 120 or 125 ft (37 or 38 m) long. Inside the plaza, just outside the theater's entrance, is a blackened-steel sculpture by Alexander Calder entitled Le Guichet. Named after the French word for "ticket window", the sculpture measures 14 ft (4.3 m) wide by 22 ft (6.7 m) high. Another sculpture by Henry Moore, entitled Reclining Figure, is in the pool. The structure faces the Metropolitan Opera House to the south; David Geffen Hall to the east; and the Juilliard School to the north, via a pedestrian bridge across 65th Street.

The library–theater building was the third to open at Lincoln Center. Original plans conceived the library and theater as separate buildings, but the structures were combined in the final plan. The theater forms the building's core and occupies the southern and western sides of the building's first and second floors. The library runs along the building's northern and eastern sides, as well as much of the third floor. The theater's stage house protrudes through the third floor, with the library running around it in a "doughnut" shape. Another entrance to the library, facing west toward Amsterdam Avenue, is below the theater. The attic houses the library's stacks.

SOM and Saarinen collaborated on the design of the exteriors. The main facade, along Lincoln Center's plaza, is two stories high and made of glass and steel. The facade consists of a glass curtain wall and two recessed square concrete columns, which create a peristyle flanking the curtain wall. Unlike the travertine surface of the plaza, the columns are finished in exposed aggregate. The columns are attached to the attic via steel pins with large bronze pyramidal covers. The other wall surfaces are clad in travertine.

The exterior of the library–theater building contains a heavy roof that protrudes over the main facade, which is covered in travertine. The roof was designed to screen the library and its performing-arts museum behind it. The top of the roof originally had an exposed-aggregate finish, but this was subsequently covered with stone pavement. On the underside of the roof are coffers containing recessed downlights as well as fluorescent uplights. Similar lighting fixtures are used in the theater's lobby as well as throughout the library's interior. The roof is carried by two Vierendeel trusses measuring 20 ft (6.1 m) high and 153 ft (47 m) long. Part of the library, housing the Vincent Astor Gallery, is placed between the trusses.