Purpose The present manuscript aims to develop and validate a theoretical model capable of explaining that organizational citizenship behavior is influenced by the extent to which employees feel valued, accepted and considered integral to the organizational fabric. To do this, the authors draw on social identity theory, according to which the level of identification of a person with a group or organization is not fixed but situational and context-dependent. Design/methodology/approach To validate the theoretical model, the authors surveyed the employees of eight large-scale distribution companies operating in Italy. Overall, the authors received completed data from 2,010 employees. Findings The authors theorize and demonstrate that the presence of an inclusive corporate climate positively influences employees’ perceptions of work inclusion and that this latter, in turn, positively affects organizational citizenship behavior. Furthermore, they show that the indirect effect of an inclusive corporate climate on organizational citizenship behavior becomes stronger when inclusive leadership is promoted within an organization. Originality/value Overall, this paper confirms social identity theory in a novel way. Social identity theory suggests that the context can impact an employee’s identification with the organization they work for, without specifying the characteristics that the context must possess. The authors’ contribution reaffirms this theory by proposing that it is specifically the inclusiveness of the context that positively influences the employee’s identification within the organization. By focusing on this aspect of inclusion, this research introduces a novel perspective that enriches the current discourse on OCB and underscores the importance of cultivating inclusive workplace environments. Also, the authors add theoretical nuance to previous literature by suggesting that the way top management exercises leadership over employees can amplify the strength of corporate climate influence on worker inclusion perception.