Site- Specific Theater is directly related to the place and space in which it is performed, and both theater on the place and place on the theater can have a mutual effect. In this research, the place and space in Site Specific Theater in Iran have been examined in the last fifty years, that is, since the first modern performances were performed in special and non- theatrical places in Iran in the late 1340s in Shiraz Art Festival until today , when many theaters and festivals with This topic is being held. Three specific places of performance have been selected as case studies, which are: performance in historical places: Persepolis Complex and performances of Shiraz Art Festival, performance in natural places: Zaribar Lake in Marivan and performances of the International Street Theater Festival, performance in urban places: Daneshjoo Park and Theater Shahr area and outdoor performances of Fajr International Theater Festival. The thematic analysis method has been used to research and analyze the findings, and to select the themes, the opinions of important thinkers in the field of place and space knowledge, Edward Soja and the theory of the Thirdspace, which is one of the leading theories about place and space have been used. From this theory and its application to site- specific theater in Iran in the last fifty years, the overarching themes and thematic formats have been extracted in order to answer the question of how site-specific theater in Iran in the last fifty years uses place and space? In response to this question, it has been shown that site- specific theater in Iran, due to the reasons that the main one is not paying attention to the audience in site- specific and also following the power that governs the space, has not been able to have an impact on the place and space, or it is affected.