Pietro Cavallini, (c.1250 – c.1330) was a painter who lived and worked in Rome in Italy in the Late Medieval period. He may have also worked in Naples. He is thought of as one of the greatest painters of his day, but has never been as well known as Giotto from Florence, who was alive at the same time. This is probably because only two pictures by Cavallini still exist. One of them is a mosaic in the Church of Santa Maria in Trastevere. The other is a fresco in the nearby convent of Santa Cecilia in Trastevere. ("in Trastevere" means "in the part of the Rome that is across the Tiber River".)