Lebedinoye Ozero, Op. 20 is a ballet written in 1875-1876 by Russian composer Pyotr Ilyich Tchaikovsky. Despite its initial failure, it is now one of the world’s most popular ballets. The two-act script, based on Russian and German folk tales, tells the story of Odette, a princess cursed by an evil sorcerer and transformed into a swan.

Julius Reisinger was the original production’s choreographer (Vaclav Reisinger). The ballet premiered on March 4, 1877, at Moscow’s Bolshoi Theater.

Although presented in numerous variations, most ballet companies base their productions, both choreographically and musically, on an 1895 revival staged for the Imperial Ballet on 15 January 1895 at the Mariinsky Theater in Saint Petersburg by Marius Petipa and Lev Ivanov. Riccardo Drigo, chief conductor and composer of the St. Petersburg Imperial Theatre, re-edited Tchaikovsky’s score for this revival.