Oberon, or The Elf King's Oath
Carl Maria von Weber (1825)
Oberto, Conte di San Bonifacio
Giuseppe Verdi (1839)
Oedipus der Tyrann
Carl Orff (1959)
Oedipus in Athens
Modest Petrovich Mussorgsky (1860)
Olimpiade
Luigi Cherubini (1783)
Olympia, Op. 18
Maurice Ravel (1899)
Omphale
Georg Philipp Telemann (1724)
Opéra-minute, Op. 98 No. 2, “L'abandon d'Ariane”
Darius Milhaud (1927)
Opéra-minute, Op. 99 No. 3, “Le délivrance de Thésée”
Darius Milhaud (1927)
Opéra-minute, Op. 94 No. 1, “L'enlèvement d'Europe”
Darius Milhaud (1927)
Orango
Dmitri Shostakovich (1932)
Orlando
George Frideric Handel (1733)
Orlando finto pazzo
Antonio Vivaldi (1714)
Orlando furioso
Antonio Vivaldi (1727)
Orphée
Philip Glass (1993)
Orpheus
Georg Philipp Telemann (1726)
Orpheus in the Underworld
Jacques Offenbach (1858)
Otello
Giuseppe Verdi (1884)
Otello, ossia Il Moro di Venezia
Gioachino Rossini (1816)
Ottone
George Frideric Handel (1723)
Ottone in villa
Antonio Vivaldi (1713)
Outer Space, Op. 62
Karlheinz Stockhausen (1986)
Owen Wingrave, Op. 85
Benjamin Britten (1970)