The Torahs, funded by donations to the Prague Jewish community, were written in Israel and brought into the synagogue in a ceremony that included scripting of the final letters by guests and members of the community, and a street dance.
"After years when Torahs were being destroyed, burnt ... the community today celebrates with its rabbi a new Torah scroll after many, many years. That is the best expression of the development of the Prague Jewish community," said deputy head of the Jewish Community of Prague, Frantisek Banyai.
The Old-New Synagogue is over 700 years old, one of the oldest existing synagogues in Europe. Apart from its significance to the community, it is the main attraction of Prague's Jewish Town, a popular destination for visitors.
Before World War II, there were about 125,000 Jews living in what is now the Czech Republic. About 80,000 were killed during the war.
The Czech Federation of Jewish Communities estimates 15-20,000 Jews live in the Czech Republic now, although only about a quarter is registered with Jewish communities or other Jewish groups.