The present study was conducted with the aim of analyzing the role of social capital on ethical consumption and happiness of consumers of green products in Mashhad. The current research is applied in terms of purpose and descriptive-survey in terms of data collection. The statistical population of this research is the consumers of green products in Mashhad. The sample size was determined based on Cochran's formula and using the available method of 384 people. The tool of data collection in this research is the standard questionnaire of Shiroufi et al. (2022). Cronbach's alpha was used to verify the reliability of the questionnaire and confirmatory factor analysis was used for the validity of the questionnaire. The obtained values indicate the reliability and validity of the questionnaire. To analyze the data, structural equation method was used via SPSS and Lisrel software. The results indicated that social capital affects the moral consumption and happiness of consumers of green products in Mashhad. Social trust affects the environment-friendly orientation and socio-economic orientation of consumers of green products in Mashhad. Social participation affects the environment-friendly orientation and socio-economic orientation of consumers of green products in Mashhad. Mutual social relations affect the environment-friendly orientation and socio-economic orientation of consumers of green products in Mashhad.