Six synagogues operated in Ksar el-Kebir during the period in which a Jewish community lived there:
- The "Del Rabbi Mosé" Synagogue, named after the rabbi and teacher Moshe Salama. Located in the Mellah.
- The "Del Tzadik" Synagogue, named after the tzadik Rabbi Yehuda Jabali. Located in the Mellah.
- The "De la Yeshiva" Synagogue. Located in the Mellah.
- The "De Melul" Synagogue, named after the chief rabbi of Ksar el-Kebir, Rabbi Rachamim Melul.
- The "De Ruben" Synagogue, named after Rabbi Ruben Barcesat.
- The "De Hermano Yair" Synagogue, named after Yair Abergel, head of the community at the end of the 19th century.
The city also had a women's mikveh. Today, the synagogues are either destroyed or in the hands of local residents.

In the photo: one of the three synagogues located in the Mellah.
