Nicola (Antonio) Porpora (or Niccolò Porpora) (17 August 1686 – 3 March 1768) was a composer and a very famous singing teacher from Italy. He composed more than 40 operas. He also composed cantatas, oratorios, sonatas for violin, and church music. Some of the famous people who studied singing and music with Porpora were the poet Pietro Metastasio, the composer Joseph Haydn, Princess Maria Antonia of Bavaria, and the castrato singers, Farinelli and Caffarelli.