Piana Crixia (; ; ) is a (municipality) in the Province of Savona in the Italian region Liguria, located about west of Genoa and about northwest of Savona. As of 31 December 2004, it had a population of 826 and an area of .
Piana Crixia borders the following municipalities: Castelletto Uzzone, Dego, Merana, Pezzolo Valle Uzzone, Serole, and Spigno Monferrato.
Piana Crixia is twinned with: