Midrange
Ristorante dell'Ancora
The owner is local and his name is Carlo, his wife silvna owns a shop in the town as well. Tiramisu is exceptionally delicious. Eat on the outside candle lit terrace surrounded by lush green vines for a more romantic experience
Maurizio
Umbrian food. Typical great dishes, gerat wines at reasonable prices.
L'Asino d'Oro
Orvieto's sole chef inspired restaurant with a menu that changes daily but stresses the boar and truffles that the area is famous for. The chef, Lucio Sforza, does the rounds and the setting is quiet with most tables outside in the patio. Closed in winter.
The gelato in piazza del Duomo is the best.
Budget
Pizzeria Charlie's- Corso Cavour. Some of the best pizza you will eat in all of Italy. A varied menu, wines, on tap beers, etc. Open for dinner at 7PM. Pizza prices range from 5-7 euros. Delicious.
Pasqueletti's- Gelateria, Next to Duomo, and on the corner of Corso Cavour and Via Duomo fresh gelato, open from mid day until 12:30PM. 2-3.5 euro for a cone/cup. They will let you put up to three flavors on one order. It's a chain-there is also another Pasqueletti's on Via Corso Cavour near to Via Duomo, a much smaller store though.
Etrusca
Traditional food in a fifteenth century building.