Santo Stefano di Magra (Ligurian: San Steva, Lunigiano Emilian: Sa' Steu) is a comune (municipality) in the Province of La Spezia in the Italian region Liguria, located about 80 kilometres (50 mi) southeast of Genoa and about 11 kilometres (7 mi) northeast of La Spezia. It is located near the confluence of torrent Vara into the Magra river. It is part of the Montemarcello-Magra Natural Regional Park. It has an entrance and exit to the toll-paying "Autostrada"
The municipality of Santo Stefano di Magra contains the frazioni (subdivisions, mainly villages and hamlets) Ponzano Magra, Ponzano Belaso, and Ponzano Superiore.
