social development of societies, is a process of integration of the individual in the community, which is formed by expressive and moral actions.During the formation of this component, many social and cultural factors such as religiosity, ethnic identity, feeling of relative deprivation, etc. are influential.The purpose is to investigate the factors affecting the social cohesion of the youth of Ahvaz city. The current research is applied in terms of purpose and descriptive-survey in terms of method.The statistical population is young men and women aged 18 - 29 in Ahvaz city in 1402 with a population of 1,245,237 people.According to Morgan's table, the sample size was 384 people, which was distributed in a three-stage cluster sampling method;The data collection tools were social cohesion questionnaires by Flensberg (2006)(22 items), religiosity by Glock and Stark (1965)(29 items), relative deprivation by Lehsaizadeh (2011)(6 items)and Hajiani's ethnic identity (2018)(15 items).The data analysis shows that the citizens had a medium level of social cohesion,ethnic identity and feeling of relative deprivation and a high level of religiosity. Inferential findings have also confirmed the hypothesis of the effect of religiosity and ethnic homogeneity on social cohesion and rejected the hypothesis of the effect of feeling of relative deprivation on social cohesion. By strengthening religiosity and ethnic identity and weakening the feeling of relative deprivation in the studied society with the special feature of ethnic and cultural pluralism, it is possible to strengthen social cohesion and, following that, national cohesion.