The Opera Comique was a 19th-century theatre constructed in Westminster, London, between Wych Street and Holywell Street with entrances on the East Strand. It opened in 1870 and was demolished in 1902, to make way for the construction of the Aldwych and Kingsway. It is perhaps best remembered for hosting several of the early Gilbert and Sullivan operas' original runs.

Opera comique may also refer to:

• Opéra comique, a genre of French opera
• Opéra-Comique, a Parisian opera company
• Opera Comique, theatre in London
• Opera Comique (Oslo), a Norwegian opera company

Opéra comique (plural: opéras comiques) is a genre of French opera that contains spoken dialogue and arias. It emerged from the popular opéra comiques en vaudevilles of the Fair Theatres of St Germain and St Laurent (and to a lesser extent the Comédie-Italienne), which combined existing popular tunes with spoken sections. Associated with the Paris theatre of the same name, the Opéra-Comique, opéra comique is not always comic or light in nature; Carmen, perhaps the most famous opéra comique, is a tragedy.

The Opéra-Comique is a Parisian opera company, which was founded around 1714 by some of the popular theatres of the Parisian fairs. In 1762 the company was merged with, and for a time took the name of its chief rival the Comédie-Italienne at the Hôtel de Bourgogne, and was also called the Théâtre-Italien up to about 1793, when it again became most commonly known as the Opéra-Comique. Today the company's official name is Théâtre national de l'Opéra-Comique, and its theatre, with a capacity of around 1,248 seats, sometimes referred to as the Salle Favart (the third on this site), is located in Place Boïeldieu, in the 2nd arrondissement of Paris, not far from the Palais Garnier, one of the theatres of the Paris Opéra. The musicians and others associated with the Opéra-Comique have made important contributions to operatic history and tradition in France, and to French opera. Its current mission is to reconnect with its history, and discover its unique repertoire, to ensure production and dissemination of operas for the wider public. Mainstays of the repertory at the Opéra-Comique during its history have included the following works which have each been performed more than 1,000 times by the company: Cavalleria Rusticana, Le chalet, La dame blanche, Le domino noir, La fille du régiment, Lakmé, Manon, Mignon, Les noces de Jeannette, Le pré aux clercs, Tosca, La bohème, Werther and Carmen, the last having been performed more than 2,500 times.