Social marketing can be defined as an application of marketing in the process of realization social goals which is not primarily based on profit, but satisfying the needs of a general or social character. Appreciating marketing concept and its proper application enhances the activity of all organizations and makes it easier to achieve goals. The goal of this paper is to present how marketing is used in non-profit organizations, with an emphasis on associations. Freedom of joining and the activity of citizen associations are crucial for public development. Volunteer work of citizen associations in many fields of activity is very efficient and often can solve many local problems with small amounts of funds. Furthermore, the paper introduces us to other forms and roles of non-profit organizations, institutions and foundations, and also the way of their fundraising. There is also a brief overview of similarities and differences between profit and non-profit sector. The application of marketing strategies is shown on the example of the Oppidum Association, association witch deals with youth education, gathering and creative companionship with youth, organizing cultural events, informing, consulting and promoting humanitarian work. Based on the survey Satisfaction and interest of Oppidum Association service users numerous obtained data are analyzed. Finaly, with noticeable area for improvement of the association, paper ends with recommendations for further work.