Sar Yazd Castle is a Sassanid fortification in the village of Sar Yazd, Yazd Province, Iran. Yazd was a major city and Zoroastrian religious center in Sassanid times and the castle was used as a safebox in the case of invasion, in which the residents could store valuables such as gold and jewels as well as other items such as food or grain. The fortress was constructed during the Sassanid era, sometime between the 3rd and 7th centuries AD and is made of adobe.