Rocca d'Arce is a comune (municipality) in the Province of Frosinone in the Italian region Lazio, located about 100 km southeast of Rome and about 20 km southeast of Frosinone.

Rocca d'Arce borders the following municipalities: Arce, Colfelice, Fontana Liri, Roccasecca, Santopadre.

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Arce is a comune (municipality) in the province of Frosinone, in the region of Lazio, Italy. it is an agricultural centre located on a hill overlooking the Via Casilina, in the middle valley of the Liri.

In the Middle Ages it followed the history of Rocca d'Arce. Later it was a fief of the Della Rovere (1475) and the Boncompagni (1612). Main sights include the Baroque Parrocchiale of Santi Pietro e Paolo (late 17th century) and the church of Sant'Antonio, which has maintained a 13th century portal.

Arce borders with the municipalities of Ceprano, Colfelice, Falvaterra, Fontana Liri, Monte San Giovanni Campano, Rocca d'Arce, San Giovanni Incarico and Strangolagalli.

Its hamlets (frazioni) are Campanile, Campostefano, Collealto, Collemezzo, Collenoci, Colleolivo, Colleone, Fontanelle, Frassi, Isoletta, Marzi, Murata, Portone, Puzzaca, Tramonti, and Valle.

Economy include the production of cereals, fruit, olives and forage. Industries include mechanics, food processing and others, all at small level.