Arsoli (Romanesco: Àrzuli) is a town and a comune in the Metropolitan City of Rome, central Italy.

The narrow ancient streets of the medieval centre are still preserved, as well as the castle, once a possession of the Benedictine Order; it dates from the 11th century.

The castle is built at the end of a spur, overlooking Arsoli on one side and extending formal gardens on the other.

four frescoed rooms on the piano nobile are flanked by guardrooms hung with arms, armor and family portraits.

[3] He commissioned Giacomo Della Porta to remodel the church and commissioned the construction of an aqueduct to supplement inadequate wells, for the abundant springs of Arsoli have been tapped to serve the city of Rome since 600 BC, traditional date of an aqueduct, built, according to tradition, by Ancus Marcius.