The book "The History of Zoroastrianism from Its Beginnings to the 20th Century" by Mary Boyce (translated by: Dr. Khalil Abd al-Rahman) is a systematic scientific study that reconstructs the history of the Zoroastrian faith from its Indo-Iranian roots and the emergence of Zoroaster, through its development in the Achaemenid, Parthian, and Sassanian eras, and on to its status in the 20th century. The research combines textual, archaeological sources, and historical analysis of beliefs, rituals, and institutions, and provides a reliable reference for researchers and interested readers in the history of religions and Iranian culture.