Rivergaro (Piacentino: Arvargär) is a comune (municipality) in the Province of Piacenza in the Italian region Emilia-Romagna, located about 150 km northwest of Bologna and about 20 km southwest of Piacenza. As of 31 December 2011, it had a population of 6,843 and an area of 43.8 km2. Localities include Ancarano di Sopra, Fabbiano, Larzano, Rallio, Niviano, Ottavello, Pieve Dugliara, Rivergaro, Roveleto Landi, Suzzano, and Case Buschi. The Medieval Castello di Montechiaro (castle of Montechiaro) is located in the locality of Rallio. Rivergaro borders the following municipalities: Gazzola, Gossolengo, Podenzano, Travo, and Vigolzone.

Demographic evolution