Santa Severa is a frazione of the comune of Santa Marinella, in the province of Rome, Lazio, Italy. It is a small sea resort on the Via Aurelia, c. south of Santa Marinella and north of Rome.
It takes its name from the 2nd-century Christian martyr. The village includes a small medieval town with a 9th-century castle facing the sea, where the ancient Etruscan port of Pyrgi was once located. The Pyrgi Tablets were found here in 1964.