Cajo Mario

{{Short description|Opera seria composed by Niccolò Jommelli}}

Cajo Mario is an opera seria in 3 acts by composer Niccolò Jommelli. The opera's Italian language libretto by Gaetano Roccaforte is based on Lucius Anneus Florus's Tito Livio e Plutarco. All of the parts are written for castrati, except for the title role, written for a Tenor. The work premiered on 6 February 1746 at the Teatro Argentina in Rome.{{Almanacco|dmy=06-02-1746|match=Cajo Mario}}