The Danial Synagogue () or Daniel Synagogue () also known as Polish Synagogue () is an Orthodox Jewish congregation and synagogue, located at 30 Tir Street (formerly known as Ghavam Al Saltaneh Street), in Tehran, in the Central District of Tehran County, in Iran. It is the only Ashkenazi synagogue in Iran.
It was mainly used during the time of the Second World War by Polish Jewish refugees. With the increase in Jewish refugees from Poland in 1940, Iranian Jews decided to build a specific Ashkenazi synagogue next to the Haim Synagogue.
When the Danial Synagogue was first opened it could hold sixty people. Three Ashkenazi-designed Torahs had been brought from Poland and were used in the synagogue. After the Iranian Revolution, most Ashkenazi Jews left Iran, so the synagogue is now mainly used by Iranian Jews.