Blessed James of Viterbo (c. 1255 – 1308), known as Giacomo da Viterbo, Jacobus de Viterb(i)o, surname Capocci(o), and nicknamed Doctor speculativus, was an Augustinian friar and student of Giles of Rome. He was born in Viterbo, Italy. He was professor of theology at the University of Paris from 1293 to 1300. He became Archbishop of Benevento in 1302, and Archbishop of Naples in 1303.