Built in 1912, the Temple Sinai is a historic synagogue in Sumter, South Carolina. It was constructed for the Congregation Sinai, officially known as the Sumter Society of Israelites, as a replacement to an older wooden synagogue in the site.

Congregation Sinai started in 1895, when the Hebrew Cemetery Society and the Sumter Hebrew Benevolent Society merged. They were served by visiting rabbis from the time of their formation until 1904 when a rabbi finally settled in the area. The synagogue was constructed after this.

The Temple Sinai still serves as a Reform synagogue. Most of its archives can already be found with the Jewish Historical Society of South Carolina. It was listed in the National Register of Historic Places in 1999.