The concept of sustainable development in the world is increasingly being implemented in the area of town planning and arrangement, but in the Republic of Croatia and in the city of Zagreb this practice is rare and at a low level, which is why the thesis establishes principles of sustainable cities. Strategic documents of EU and Republic of Croatia on sustainable development, in particular its spatial and landscape aspect, as well as professional literature on sustainable cities, have been analyzed in the thesis. The most important principles were selected and categorized into four categories: green areas, traffic, construction and local identity, and according to the above principles the City of Zagreb was analyzed. After the conducted analyzes of spatial planning documentation and on-site analysis, ratings were assessed for each category and it was concluded that three out of four categories cannot be said to be in accordance with the principles of sustainable development. Consequently, at the end of the work, a series of proposals for the implementation of these principles were adopted in order to develop Zagreb into a sustainable city.