Considering the importance of urban parks and green spaces and their role in urban life, this study undertook evaluation of parks and urban green spaces in District 8, Tehran. It is a descriptive-comparative research. Based on theories and concepts, as well as on the world and national cases, evaluation of the parks in District 8 was conducted. Accordingly, major parks were evaluated at different scales such as zone, neighborhood, and neighborhood unit. A researcher-designed survey whose validity was approved by experts, and whose reliability was determined at 95% was carried out. The results were categorized into two groups, i.e. qualitative and quantitative. Per capita green space in District 8 is estimated to be 4.2 [m.sup.2] which is minute in comparison with Tehran's per capita green space, estimated at 28.9 [m.sup.2]. Furthermore, inappropriate distribution and low ecological function, especially in spring and summer, are among the weaknesses of the district green spaces. The district parks do not have favorable condition in terms of safety and security. This leads to fewer visits and less use by different age groups. Inadequate number and diversity of facilities and installations of the parks, and also lack of public participation with respect to park management are among the negative points. As far as superstructure is considered, the parks comply with the existing standards. Keywords: Green space Per Capita, Environmental Pollutions, Urban Park, City of Tehran.