Oriolo Romano is a comune (municipality) in the Province of Viterbo in the Italian region Latium, located about 40 kilometres (25 mi) northwest of Rome and about 30 kilometres (19 mi) 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.