The book Registers of Ashkenazi Communities in Italy from the 18th Century presents a scientific edition of three files documenting customs in Ashkenazi communities in the north of Italy in the 18th century, from Trieste, from Mantua and Padova, with an introduction and indices. The world of Halacha in Italy, starting from the beginning of the Rishonim period, was influenced by different centers, and was not an independent center. Ashkenazi Judaism had a decisive influence on Italy beginning in the 13th century. Files documenting customs of Ashkenazi communities existed already in the 11th century and continued to be written throughout the generations in the Ashkenazi communities. However, files documenting the customs of Ashkenazi communities on Italian soil were relatively few. The book before us hence makes up a little for this lack. It is true that the writing of files documenting customs is an Ashkenazi phenomenon, we have found it among Ashkenazi people in all generations, but in the 17th-18th centuries, which are documented by the files before us, the Jewish communities in Ashkenaz and in Italy were subject to the influence of important historical processes, such as heated rabbinic polemics, the beginning of the Enlightenment, the French Revolution and its cultural and political effects and the emancipation processes. These processes had a profound impact on the Jewish world and we find echoes of this impact in the custom files as well. The certificates published here were written at a unique historical, cultural and religious junction, and have great significance in all these fields.