Arena Po () is a (municipality) in the Province of Pavia in the Italian region of Lombardy, located about southeast of Milan and about southeast of Pavia. As of 31 December 2004, it had a population of 1,595 and an area of .
Arena Po borders the following municipalities: Bosnasco, Castel San Giovanni, Pieve Porto Morone, Portalbera, San Zenone al Po, Spessa, Stradella, Zenevredo, and Zerbo. Composer Giovanni Quirici was born in the .