Oriolo Romano is a comune (municipality) in the Province of Viterbo in the Italian region Latium, located about 40 km northwest of Rome and about 30 km south of Viterbo on a hilly area near the ancient Via Clodia.
- Palazzo Altieri di Oriolo, enlarged in 1674 during the papacy of Clement X, a member of the Altieri family. It has frescoes with stories of the Old Testament and landscapes of Altieri's former fiefs.
- Fontana delle Picche, fountain designed by Jacopo Barozzi da Vignola.
- Olmate, a complex of tree-sided alleys which connects Oriolo to Montevirginio, a frazione of Canale Monterano.
- ^ All demographics and other statistics: Italian statistical institute Istat.