La finta semplice (The Fake Innocent), K. 51 (46a) is an opera buffa in three acts for seven voices and orchestra, composed in 1768 by then 12-year-old Wolfgang Amadeus Mozart. Young Mozart and his father Leopold were spending the year in Vienna, where Leopold was trying to establish his son as an opera composer. He was acting on a suggested request from the Emperor Joseph II that the young boy should write an opera.

Librettist Marco Coltellini (Italian libretto by the Vienna court poet Marco Coltellini, which was based on an early work by Carlo Goldoni)
Date of composition 1768 in Vienna, Austria
Premiered 1769, May 1st (Archbishop's Palace) in Salzburg, Austria
Type Opera Buffa
Catalogue KV 51 (46a)
Spoken language Italian
Instruments Voice - Solo voices ;
Orchestra
Voice (Tenor) - Fracasso, a Hungarian captain lodging with Cassandro
Voice (Soprano) - Rosina, his sister, a baroness
Voice (Bass) - Cassandro, a tyrannical misogynist
Voice (Tenor) - Polidoro, his timid brother
Voice (Mezzo-Soprano) - Giacinta, their sister, evidently no longer young
Voice (Bass) - Simone, Fracasso's orderly, in love with Ninetta
Voice (Soprano) - Ninetta, Giacinta's maid
Autotranslations beta Wolfgang Amadeus Mozart: La finta semplice, KV 51 (46a) "The Fake Innocent"
Wolfgang Amadeus Mozart: La finta semplice, KV 51 (46a) "The Fake Innocent"
Wolfgang Amadeus Mozart: La finta semplice, KV 51 (46a) "The Fake Innocent"