In the last decades cities' unique structures, architecture, traditions, customs, local cuisine, historical identity, natural resources, and quality of life have been endangered by the pace of rapid development of globalization. In response, a new stream labeled "Cittaslow" was adopted that advocates sustainable urban development focusing on the improvement of quality living. The "Cittaslow" movement envisages the development of urbanism by protecting unique characteristics, structures, arts, cuisine, and social cohesion without harming nature. In fact, the notion of "Cittaslow" embracing the dimensions of sustainability forms a favorable basis for sustainable tourism. Thus, sustainable tourism is oriented toward contributing to the local economy, protecting natural resources and cultural heritage, and improving the life quality of residents and visitors by minimizing the negative effects of tourism on both society and the environment. In this study, the notion of "Cittaslow" is considered an important tool that supports the development of sustainable tourism. Thus, the criteria of the "Cittaslow" notion coincide with the goals of sustainable development within the context of sustainable tourism. Ultimately, the cities in Turkey with the title of "Cittaslow" as of April 2023 are dissected according to some sustainability practices. In conclusion, this study emphasizes the importance of the "Cittaslow" movement in the development of sustainable tourism is adverted.