Abstract: Festival tourism is a dynamically growing sector of tourism, the number of festival visitors are increasing, and the travel motivations for this reason are strengthening. The festivals use and shape their natural and social environments and they play an important role in the environmental, economic and social sustainability of their regions. Taking into account the tourism effects of festivals, it is important to interpret the issue of sustainability. Our main research questions are: How does the festival affect the lives of the local community? What does it cause in the economy of the region? How does it change the immediate environment? The research has two parts. Firstly, Hungarian festivals are analysed and evaluated on the basis of the information available on their websites. There are seven pre-determined criteria factors: 1. the quality of locals’ lives; 2. change and enlargement of employment structures; 3. change of value-system; 4. development of individual, family and social relationships; 5. expressions of creativity; 6. local community organizations; and 7. change and preservation of traditions. The second part of the research was a series of interviews, where the main criteria were the same seven ones. The aim of the study is to highlight the most important points in terms of sustainability and to present positive examples of how festivals can positively contribute to sustainability issues.