The aim of the article is to draw attention to the issue of using modern technologies to create smart cities, also known as 15-minute cities or compact cities. Many such cities already exist worldwide, and others draw inspiration from their models. In Poland as well , efforts are being made to create smart cities that guarantee both sustainable development and an improvement in the quality of life for residents. In this regard, the primary role rests with local governments. The concept of a smart city was emphasized in the 2015 United Nations resolution called Agenda 2030, which highlights that the changes introduced in the functioning of cities are meant to promote social cohesion. The principles outlined in Agenda 2030 have the support of the European Commission, among other things, in the “Horizon Europe” program. The concept of a smart city revolves around ensuring that every resident has access to basic life necessities within a 15-minute walking or cycling distance from their home or by using public transport. The fundamental thesis arising from the above considerations is that actions aimed at creating smart cities have an impact on the sustainable environmental, social, and economic development, while also carrying risks that may limit residents’ rights and threaten their privacy.