Teatro Avenida, Art theatre on Avenida de Mayo, Buenos Aires, Argentina.

Teatro Avenida is a theatre on Avenida de Mayo in central Buenos Aires, Argentina, housed in a building from the early 20th century. It has multiple seating levels and an interior decorated in the ornate style typical of European opera houses of that era.

The theatre opened on 3 October 1908 with Lope de Vega's Justice Without Revenge, performed by the María Guerrero–Fernando Díaz de Mendoza company, and from 1910 became a zarzuela venue. A 1979 fire in adjoining offices caused parts of the theatre to collapse, halting the musical El diluvio que viene; the hall stayed closed and abandoned until a Spanish-Argentine consortium restored it, reopening on 19 June 1994. The original building's top section, which housed the former Hotel Castilla, was not restored.

The Teatro Avenida has long been the main home of zarzuela in Buenos Aires, a form of Spanish musical theatre that mixes spoken dialogue with sung passages. Attending a show here gives visitors a rare chance to see a tradition that is rarely staged elsewhere in Argentina.

The theatre sits on Avenida de Mayo, one of the main streets in central Buenos Aires, making it easy to reach by metro or on foot from nearby landmarks. It is worth checking the box office hours in advance, as they can vary depending on the programme.

The 1994 reopening concert featured tenor Plácido Domingo with Madrid mezzo-soprano María José Montiel, Argentine singers Paula Almerares and Cecilia Díaz, and the Coro Polifónico Nacional. The 1979 fire began in neighbouring offices and caused parts of the theatre's installations to collapse, interrupting the musical El diluvio que viene.