Piateda is a comune (municipality) in the Province of Sondrio in the Italian region Lombardy, located about northeast of Milan and about east of Sondrio. As of 31 December 2004, it had a population of 2,291 and an area of .
Piateda borders the following municipalities: Albosaggia, Caiolo, Carona, Faedo Valtellino, Montagna in Valtellina, Poggiridenti, Ponte in Valtellina, Tresivio, Valbondione.
It is located alongside the Adda river.