Undina (sometimes Undine or Ondine) (Russian: Ундина) is an opera in 3 acts by Pyotr Ilyich Tchaikovsky. The work was composed in 1869. The libretto was written by Vladimir Sollogub, and is based on Vasily Zhukovsky's translation of Friedrich de la Motte Fouqué's Ondine.

Librettist Vladimir Sollogub (Based on "Ondine" by Friedrich de la Motte Fouqué)
Date of composition 1869 (January to July 1869. Tchaikovsky destroyed the score in 1873, preserving only a few numbers from the opera)
Premiered 1870, March 28th (Bolshoy Theatre) in Moscow, Russia
First published 1950 in Moscow, Russia
Type Opera
Approx. duration 15 minutes
Spoken language Russian
Instruments Orchestra
Voice (Bass) - Goldmann, an old fisherman
Voice (Mezzo-Soprano) - Bertha, Goldman's wife
Voice (Soprano) - Undina, Goldman's adopted daughter
Voice (Tenor) - Huldbrand, a knight
Voice (Bass) - The Duke
Voice (Mezzo-Soprano) - Berthalda, the Duke's daughter
Chorus/Choir - Mixed Chorus ; People
Autotranslations beta Piotr Ilitch Tchaïkovski: Undina
Pëtr Il'ič Čajkovskij: Undina
Pjotr Iljitsch Tschaikowski: Undina