The Ostia Synagogue is an ancient former Jewish synagogue and archaeological site, located in ancient Ostia, the seaport of Imperial Rome, in modern-day Lazio, in Italy.

[3] In its earliest form, the synagogue featured a main hall with benches along three walls; a propylaeum or monumental gateway featuring four marble columns; and a triclinium or dining room with couches along three walls.

The main door of the synagogue faces the southeast, towards Jerusalem.

A donor inscription implies that it replaced an earlier wooden platform donated in the 2nd century AD, which itself had been replaced by a newer Ark donated by one Mindus Faustus in the 3rd century AD.

[1] Media related to Synagogue of Ostia at Wikimedia Commons