THIS ARTICLE IS ABOUT THE RELATIONSHIP BETWEEN ZOROASTRIANS FESTIVALS AND rituals AND MYTH. THE CELEBRATIONS INCLUDE MONTHLY AND BIG SEASONAL CELEBRATIONS THAT SOME OF THEM ARE RELATED TO AMSHASPANDAN OR GREAT GODS; OF THOSE CELEBRATIONS ORDIBEHSHTGAN, KHORDADGAN, AMORDADGAN, SEPANDEGAN, SHAHRIVARGAN AND BAHMANGAN RELATED TO THE MYTH AMSHASPANDAN AND TIRGAN, MEHREGAN, ABANGAN AND AZARGAN RELATED TO THE MYTH GODS. ALSO IN THE FESTIVAL, TRACES OF LEGEND HOOSHANG, JAMSHID, FEREYDOON AND ARASH THE ARCHER BE SEEN. IN ADDITION TO THESE CELEBRATIONS, RITES RELATED TO THE HOOM AND CEREMONIES OF THE DECEASED HAVE MYTHICAL ORIGIN. THE PURPOSE OF THIS PAPER THAT DESCRIPTIVE AND ANALYTICAL WRITTEN IS TO EXPRESS THE MYTHICAL ORIGINS OF MANY OF TODAY'S CELEBRATIONS AND rituals OF THE ZOROASTRIANS.