The non-profit sector has had a great influence on society for years and has been the subject of numerous researches, discussions and publications. Non-profit organizations, unlike for-profit organizations whose primary goal is to make a profit, participate in solving social problems and encourage change in society. These organizations use non-profit marketing in their business, through which they design and implement activities whose main goal is the realization of some of the public interests. The most common forms of non-profit organizations are institutions, associations, endowments and foundations. One of the non-profit associations that has been successfully operating in the Republic of Croatia for fourteen years is the non-profit association "RTL helps children". To date, it has connected with numerous non-profit organizations operating in the Republic of Croatia for the purpose of improving the lives of young people, participated in the implementation of more than 300 projects and donated more than 18 million kunas to various non-profit organizations. This Association conducts modeling activities and communication with the general public through its official website, official Facebook page and through the RTL Hrvatska television channel. In conducting non-profit marketing, the Association is more than successful, which is shown in large number of donations coming from the public and public interest in projects that the Association supports even after fourteen years of work of the Association. For the long-term survival of non-profit organizations, they equally need human and financial resources. It is in the interest of all states, given the influence and importance that non-profit organizations have for their development, to encourage the development of the non-profit sector and enable non-profit organizations to operate.