Public transport in Zagreb, the capital of Croatia, is a key component of urban life, enabling thousands of citizens to get around on a daily basis. The system consists of trams, buses and suburban trains that together form a network that connects various parts of the city and surrounding settlements. User satisfaction with this system has a direct impact on the quality of life, the environment and the economic development of the city. The Zagreb Electric Tram (ZET) is the main provider of public transport services in Zagreb. The tram network has 15 lines that cover most of the city's areas, while the bus network complements the tram connection of areas not covered by trams. Commuter trains connect Zagreb with the surrounding cities and towns, thus ensuring the mobility of the wider region. The results of the user satisfaction survey showed that the main problems are delays and insufficient connectivity of certain parts of the city, especially the suburbs. Users expressed dissatisfaction with the overcrowding of vehicles during peak hours. On the other hand, users are often satisfied with the cleanliness of the vehicle and the courtesy of the driver. User satisfaction with public transport in Zagreb is key to the city's sustainable mobility. While there are challenges that need to be addressed, continued investment and improvements can significantly improve the user experience. Regular research and user feedback are key to adapting and developing a system that meets the needs of all citizens.