Giustino ("Justin", HWV 37) is an opera seria in three acts by George Frideric Handel. The opera was first given at the Covent Garden Theatre in London on 16 February 1737.The Italian-language libretto was adapted from Charles VI's court poet Pietro Pariati's libretto for Giustino (1711), after the much older original libretto of Nicolò Beregan (1682). The libretto had already been adapted by many composers including Vivaldi's Giustino of 1724 and Tomaso Albinoni's lost opera of 1711.

Librettist Unknown (after Nicolò Beregan/Pietro Pariati)
Date of composition 1736 (August 14 to October 10 1736)
Premiered 1737, February 16th (Covent Garden Theatre) in London, UK
Type Opera Seria
Catalogue HWV 37
Spoken language Italian
Instruments Voice (Castrato) - Giustino
Voice (Castrato) - Anastasio
Voice (Soprano) - Arianna, widow of the emperor
Voice (Contralto) - Leocasta
Voice (Contralto) - Amanzio
Voice (Bass) - Polidarte
Voice (Tenor) - Vitaliano
Voice (Treble) - La Fortuna
Autotranslations beta Georg Friedrich Haendel: Giustino, HWV 37
Georg Friedrich Händel: Giustino, HWV 37
Georg Friedrich Händel: Giustino, HWV 37