Abstarct: In today's world, psychological well-being is increasingly recognized as a crucial component of human health. This research aims to investigate the relationship between the residential environment in community complexes in District 9, Shahrestani neighborhood of Mashhad, and the psychological well-being of its residents. The primary research question is: What is the relationship between the residential environment of these complexes and the psychological well-being of the residents in this area? In this study, data were collected from a sample of 177 individuals using questionnaires. A researcher-developed questionnaire was used to assess environmental factors, while the World Health Organization's WHO-5 questionnaire was utilized to measure psychological well-being. The reliability of the questionnaires was confirmed using Cronbach's alpha, and their validity was established through exploratory factor analysis. Additionally, content validity was verified by several university professors. Statistical methods employed included exploratory factor analysis, one-sample t-tests, and correlation analysis, with SPSS 27 software used for data analysis. The exploratory factor analysis identified three key components: Environmental, Functional-Structural, and Spatial-Physical. The status of these components in the Shahrestani neighborhood is as follows: the Environmental component is at a moderate level, while the Functional-Structural and Spatial-Physical components are above average. The findings suggest that the physical design and availability of public spaces have a significant impact on the psychological well-being of residents. The research also provides strategies for enhancing environmental quality and improving psychological well-being in this area.