The Carl Rosa Opera Company was founded in 1873 by Carl August Nicholas Rosa, a German-born musical impresario, to present opera in English in London and the British provinces. The company premiered many operas in the UK, employing a mix of established opera stars and young singers, reaching new opera audiences with popularly priced tickets. It survived Rosa's death in 1889, and continued to present opera in English on tour until 1960, when it was obliged to close for lack of funds. The company was revived in 1997, presenting mostly lighter operatic works including Gilbert and Sullivan. The company "was arguably the most influential opera company ever in the UK".
Carl Rosa was born Karl August Nikolaus Rose in Hamburg, Germany, the son of a local businessman. A child violin prodigy, Rosa studied at the Conservatorium at Leipzig and in Paris. In 1863 he was appointed Konzertmeister at Hamburg, where he had occasional opportunities to conduct. He soon had considerable success as a conductor both in England and the United States. During an American tour in 1866–67 as conductor of a concert troupe that included the Scottish operatic soprano Euphrosyne Parepa, Rosa and Parepa were married.
From 1869 to 1872, Rosa and his wife toured their own opera company through America, with Parepa as the star and Rosa as the conductor. It brought opera to places that had never seen any, performing Italian operas in English, which made them more accessible to American audiences.
In 1872, the Rosas returned to England and also visited Europe and Egypt. In September the next year, they inaugurated the "Carl Rosa Opera" with a performance of William Vincent Wallace's Maritana in Manchester, on 1 September, and then toured England and Ireland. Rosa's policy was to present operas in English, and that remained the company's practice. Parepa died in childbirth in January 1874, and Rosa married a second time in 1881, to Josephine (d. 1927), with whom he had four children. In November 1874, Carl Rosa Opera made its first of many visits to Scotland with a two-week season at Glasgow's Prince of Wales Theatre. The company's first London season opened at the Princess's Theatre in September 1875, playing Mozart's The Marriage of Figaro, with Charles Santley as Figaro and Rose Hersee as Susanna. In 1876, Rosa staged a second London season, which featured the first performance in English of Wagner's The Flying Dutchman, with Santley in the title role.