Carl August Nicholas Rosa was a German-born musical impresario best remembered for founding an English opera company known as the Carl Rosa Opera Company. He started his company in 1869 together with his wife, Euphrosyne Parepa-Rosa, and popularised opera in Britain and America, performing standard repertory in English, as well as operas by English composers.

The Carl Rosa Opera Company was founded in 1873 by Carl Rosa, a German-born musical impresario, and his wife, British operatic soprano Euphrosyne Parepa-Rosa 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 those by Gilbert and Sullivan. The company "was arguably the most influential opera company ever in the UK".