Prata Camportaccio is a comune (municipality) in the Province of Sondrio in the Italian region Lombardy, located about north of Milan and about northwest of Sondrio. As of 31 December 2004, it had a population of 2,758 and an area of .
Prata Camportaccio borders the following municipalities: Chiavenna, Gordona, Mese, Novate Mezzola, Piuro, Samolaco.