English National Opera (ENO) is an opera company based in London, England. The opera house where it performs is called the London Coliseum. It is in St. Martin's Lane, very near Trafalgar Square. It is one of the two big opera companies in London. The other big one is the Royal Opera (ROH), Covent Garden. The English National Opera is different because the operas there are always sung in English. The ticket prices are not quite as high as at the ROH.