Terra-cotta roof tiles are some of the most common and volume-intensive finds in the excavation of ancient synagogues, but their significance has received only minor consideration. This article reviews the evidence for terra-cotta roof tiles, which were the preferred roofing used in ancient synagogues in the Late Roman and Byzantine periods. A change took place from non-tiled roofs in Early Roman synagogues to the common use of terra-cotta roof tiles in the later synagogues. It will be suggested that this shift in roofing style was not merely a functional one, but part of the broader developments in synagogue-building, from a place of gathering in the Early Roman period, with an unassuming flat roof, to a more ornate and monumental structure (both internally and externally) with a prominent high tiled roof in plain view.