In our age, where most relationships are more fragile, uncertainties and risk factors increase, and the concept of trust emerges as a solution. Trust is one of the most essential human needs. The concept of trust is important in terms of ensuring sustainable communication and the consistent and healthy progress of human relations. The existence of croporate trust can prove to be effective in topics such as employee loyalty, organizational justice, job satisfaction and motivation, corporate reputation and corporate productivity. It can be said that strategically planned and expert-supported in-house public relations practices can be effective in ensuring organizational trust. This study focuses on whether there is a relationship between internal communication activities and trust building between colleagues, managers and organizations. Using the survey technique, one of the quantitative research methods, the relationship in question is tested on a sample of 651 public and private (national and global) organizations and NGO employees. In this context, it is observed that internal communications have a strong, meaningful and positive effect on trust. It is concluded that there is a positive correlation between the internal communication activities and the trust of the employees towards their colleagues, managers and organizations.