Scholars have increasingly been interested in organizational identification as a phenomenon helping to gain insights into the connection between employees and their organizations. Most studies on the subject have relied on social identity theory, which focuses on cognitive categorization processes yet overlooks the role of employees’ relationships within their organization. In this paper, following the recent relational approach to organizational identification, we introduce a social capital perspective into organizational identification models. We propose and test a novel model looking at the influence of an individual’s social capital, constituted by multiple social network dimensions, on organizational identification mediated by the attractiveness of perceived organizational identity. The results from a survey conducted in a business organization suggest that a person’s social capital influences organizational identification, both directly and through the attractiveness of perceived organizational identity. We thus contribute to extending the understanding of organizational identification and its antecedents from a relational perspective.