The topic of this paper is Marketing of non-profit organizations. Non-profit organizations are organizations do not receive monetary compensation. These are societies of free citizens with the same opinions, which unite with the goal of social progress, improvement, development or help for the environment. In this paper, which covers the topic of marketing of non-profit organizations, will be studied the concept and classification of non-profit organizations, then benefits from application of that marketing in non-profit organizations, and to whom is directed the marketing of non-profit organizations. Furthermore, it is elaborated the implementation of marketing, areas of application of the strategy and the application of non-profit organizations on the example of associations Zelena Istra, which is committed to the protection of the environment and natural resources. It describes how the association uses its marketing activities, what and to whom they are directed. In the end, it was written critical review of the association Zelena Istra, where it is discussed does the association implement the criteria of a successful non-profit organization.