Onofrio Avellino (c. 1674-17 April 1741) was an Italian painter of the Baroque period.
Born in Naples, Giulio died in Ferrara [1] or Rome, where he painted for the last twenty years of his life. He initially trained underLuca Giordano, but in 1692, he entered the studio of the Neapolitan Francesco Solimene[2]. His elder sibling was, reputedly, Giulio Giacinto Avellino, also a painter, born in 1645. By 1718, he had transferred to Rome, where he was influenced by Carlo Maratta. His frescoes on the vault of San Francesco di Paola ai Monti in Rome are by Onofrio. He painted an altarpiece on the Life of San Alberto for the church of Santa Maria de Montesanto.