Lviv (also known as Lemberg and L\'vov) was the home of one of the oldest and most prominent Jewish communities in Eastern Europe. This guide provides comprehensive descriptions of 235 archival collections related to Jewish history and culture that are held in Lviv archives, libraries, and museums. Most of these rich materials have been unknown to specialists in Jewish studies and have not been examined or utilized in scholarship. The archival holdings that are described in the guide relate to a broad timeframe from the mid-14th century to the early 21st century. They shed light on the Jewish experience in Lviv, the surrounding region of Galicia, other regions of Ukraine, as well as Poland, Belarus, Lithuania, Latvia, and Yugoslavia. The guide is the product of extensive work by a team of researchers, who began their work before the Russian attack on Ukraine and concluded it during the course of the war. An essential reference book for those interested in Jewish and Eastern European history.