Abstract:The purpose of this paper is to determine if there are links between interpersonal trust and competences, relations, and cooperation in Polish telecommunications companies. It examines which factors affect trust in co-workers and managers in sustainable organizations. The paper surveys a sample of 175 employees of telecommunications companies in Poland by means of a questionnaire. The results indicate that competences, relations, and cooperation are related to interpersonal trust. Regression analysis showed that competences and relations predict a significant variance in trust amongst co-workers. Additionally, cooperation contributes to prediction of trust in managers. Given the importance of trust in sustainable organizations, better comprehension of which factors are related to team confidence provides valuable information for stakeholders and about how to improve interpersonal trust in sustainable organizations.