The aim of this study was to investigate the relationship between environmental identity, environmental attitudes, and the green psychological climate in creating environmental citizenship behavior. This study was applied in a descriptive and surveyed manner. The population of the study included 212 employees of Shiraz municipality who were selected through available sampling method. Partial least squares method and Smart PLS2 software were used for data analysis. Convergent validity was used to assess the validity and Cronbach's alpha was used to fit the reliability and its coefficient was greater than 0.7 for all research constructs. The findings show that environmental identity and environmental attitudes have a positive and significant effect on green psychosocial climate. The findings confirmed the positive and significant effect of green psychosocial climate and environmental citizenship behavior. The green psychological climate does not mediate the relationship between environmental identity and environmental citizenship behavior, but it does mediate the relationship between environmental attitudes and environmental citizenship behavior.