Lardirago is a comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about 25 km south of Milan and about 9 km northeast of Pavia.

Lardirago borders the following municipalities: Bornasco, Ceranova, Marzano, Roncaro, Sant'Alessio con Vialone.

Lardirago is twinned with:

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