Francesco Feo (1691 – 28 January 1761) was an Italian composer, known chiefly for his operas. He was born and died in Naples, where most of his operas were premièred.
Feo studied music at the Conservatorio di Santa Maria della Pietà in Naples, starting on 3 September 1704. Among the other composers he met there were Leonardo Leo, Giuseppe de Majo (who would later marry his niece), and Niccolò Jommelli. His first teacher was Andrea Basso, and after 1705 Nicola Fago, who had only just been appointed. Feo remained at the conservatory until some time around 1712.
In 1713 he presented his first opera, L’amor tirannico, ossia Zenobia (Tyrannical Love, or Zenobia), and for carnival 1714 Il martirio di Santa Caterina (The Martyrdom of Saint Catherine of Egypt), an oratorio. His fame began to increase with sacred works for local churches, such as his Missa defunctorum (Requiem Mass) in 1718, and with his recitatives, arias and comic scenes for performances of operas by other composers when they were staged in Naples. In 1719 Feo wrote La forza della virtù (The Power of Virtue), and then his opera seria Teuzzone in 1720. Real fame only came with his opera seria Siface, re di Numidia (Syphax, King of Numidia), for the Teatro San Bartolomeo in 1723. The libretto was the first attempt at dramma per musica by the 25-year-old Pietro Metastasio, who had just arrived in Naples.
With his increasing popularity, Feo was appointed as a teacher in the Conservatorio di Sant'Onofrio a Porta Capuana, where he worked alongside Gabriele Prota and took over from Nicola Grillo. In the next sixteen years he became known as one of the most important teachers in Naples. Among his students at Sant'Onofrio were Nicola Sabatino, Nicolò Jommelli, Matteo Capranica, and Gennaro Manna. In 1739 he left Sant'Onofrio to teach at the Conservatorio dei Poveri di Gesù Cristo, to replace Francesco Durante who had just retired. Feo would stay there until 1743, helped by Alfonso Caggi and later Girolamo Abos. During his time there, he taught Giacomo Insanguine and Gian Francesco de Majo.