This study, which was prepared based on Social Identity Theory and Self Classification Theory, examines the relationships between organizational identification, job involvement, and job performance variables in a sector such as the defense industry, which hosts a qualified workforce and highly educated employees. It also examines the mediating role of job involvement in the relationship between organizational identification and job performance. In this study, it is assumed that employees who identify with their organizations will cause an increase in individual job performance through positive behaviors and attitudes such as job involvement. For this reason, a survey was conducted on the employees of small-scale private enterprises operating in the defense industry in Ankara. According to the findings, organizational identification affects job performance positively and significantly. In addition, organizational identification positively and significantly affects job involvement; It has been found that job involvement has a positive and significant effect on job performance. The study also concluded that job involvement has a mediating role in the relationship between the organizational identification of the employees in the defense industry and their job performance. From these findings obtained from the research, it is concluded that organizational identification and job involvement are the antecedents of individual job performance.