Objective: The elements of the relational dimension of social capital were identified in the Public Library "Ruben Martinez Villena" in Old Havana (PLRMV). The benefits of the presence of this dimension in said entity for the development of the community were valued. Design/Methodology/Approach: The research developed was mixed (quantitative-qualitative) and descriptive in scope, using the techniques of documentary analysis, in-depth interview, questionnaire and social mapping. Results/Discusion: It was explored the importance of social capital and its relational dimension as an essential asset in the management processes of information organizations and mainly in the context of the public library for community development. Conclusions: An empirical study was carried out that made it possible to exhaustively identify the elements of the relational dimension of social capital in the PLRMV. The study made it possible to emphasize that the relational dimension of social capital is a benefit of great importance for libraries. Originality/Value: The presence and development of the relational dimension of social capital is of great importance in the context of the public library. Its attributes strengthen links in the networks of social relationships with which it interacts, guarantees its permanence over time and benefits to the entity through collective actions that allow the execution of processes aimed at fulfilling its social mission.