Internal marketing is now becoming more and more important part to all organizations striving for market success and for attracting and retaining the best employees. Employee skills and their knowledge are the most important company´s resources. Therefore, internal marketing aims to effectively manage this sensible capital. The purpose of this Master´s Thesis is to investigate the implementation of internal marketing activities at non-profit organization GDCK Vinkovci. The findings of the study reaffirmed the theoretical knowledge that also non-profit organizations apply internal marketing activities and instruments to foster market orientation. Since lower salaries are a reality for nonprofit organizations, it is hard to bring in good people, even harder to develop and to keep them engaged. In order for nonprofit organizations to compete for high talented and in order to motivate existing employees fundamental component called internal marketing must be present. According to the research, the respective company is aware of the need to apply activities related to the internal marketing. Moreover, employees have expressed a positive attitude and interest towards internal marketing and its formal application, although personnel is aware of existing barriers to its implementation. Despite the existing awareness of implementation of the internal marketing activities within GDCK Vinkovci, it is evident there is still room for improvement.