This paper discusses the key aspects of the financing of non-profit organizations. These are the most important parts, such as: the participants, mission and vision, a way to manage that type of organization, and all types of funding sources which are non-profit organization funded in Croatia and in the world. As an example of how the financing of non-profit organization, presented the Green Action, a voluntary association that work on protection of nature, the environment, aid to citizens in case of miscarriage of fundamental human rights as ensuring legal regulations, opportunities for public participation and information of the environment and carries out a fair is conscientiously through the last 25 years since there. We talk about the important programs that actively carried out in recent years, through projects such as the Green Phone and the Centre of the Environment, including those successfully completed: the preservation of plant and animal habitat on Velebit, construction of roads away from the watercourse of the river Gacka, protection of Velebit and the wider area conservation of forests against excessive logging in Slavonia. Green Action will continue to carry out their projects in Croatia using donor money and contribution of other non-profit institutions which is connected as a partner and the withdrawal of money from EU funds for the protection of nature and natural resources. An example of this is the project: “Sava culture NATURA”, which will the Green Action implement aims to protect top and the bottom of river basin, and its cultural and economic development, for the citizens who live there and for those who come to feel the power of positive environmental impacts.