Sermoneta is a hill town and comune in the province of Latina, central Italy. It is a walled hill town, with a 13th-century Romanesque church, the Collegiate Church of Santa Maria Assunta and a massive castle, built by the Annibaldi family then purchased and expanded by Caetani family in the 13th century. The Cistercian Valvisciolo Abbey is located nearby. The churches of San Giuseppe and San Michele still stand.