La Nitteti is an 18th-century Italian opera in 3 acts by the Czech composer Josef Mysliveček. It was composed to a libretto by the Italian poet Metastasio that was first performed in 1756, one of the newer (and less popular) of the Metastasian librettos in Mysliveček's day. For a performance in the 1770s, it would only be expected that a libretto of such age would be abbreviated and altered to suit contemporary operatic taste. This opera contains more substitutions of original aria texts than any other Mysliveček setting of a Metastasian libretto. The cuts and changes in the text made for the 1770 performance of Mysliveček's opera are not attributable. All of Mysliveček's operas are of the serious type in Italian language referred to as opera seria.