Yazd Mosque is one of Iran>s Azeri style mosques, in whichthe implementation of motifs in stucco and tiling is noteworthy. The monument of Sheikh Safi al-Din Ardabili that was built in 753 AD, and several units were added to it during the reign of the Safavids, contains dozens of exquisite themes of various art disciplines such as mosaic tiling, Muqarnas, stucco, exquisite inscriptions, wood carving, silverwork, illumination and gilding. The main objective of this research is a comparative study of the designs in these twoSafavid-era buildingswhich symbolic aspect involves Shiite religious thoughts. Therefore initially the symbolic Shiitepatterns in these buildings, including various types of stars and suns, are selected and then studies and investigated. This study seeks to answer two questions, namely: What kinds of decorative motifs in Islamic monuments are related to Shiite beliefs dominant in the community? Do Shiite symbolic decorative patterns in these twobuildings have similarities with regard to their spatial distance from each other? This study revealed that the decorative geometric patterns (pentagonal, hexagonal, octagonal, ten and twelve-sided polygons)in these two buildings have symbolic meanings related to Shiite beliefs which are similar not only regarding technique, form and appearance but also in terms of symbolic meaning.