The research topic of this thesis is the prevention of marine pollution from sanitary wastewater from cruise ships. A cruise ship is a large passenger ship used for organized passenger cruises. Cruise tourism is a form of tourism based on travel where passengers can explore different destinations and enjoy various activities and facilities offered on board. Cruise ships have become an increasingly popular form of tourism over the past thirty years, offering comfort and diverse experiences to travelers around the world. However, their increasing presence also brings with it the responsibility to protect the fragile marine ecosystem and maintain the quality of the environment. This thesis explores the problem of marine pollution from cruise shipderived sewage and examines the impact of such pollution on the marine ecosystem. By analyzing the popularity of cruise tourism, the increase in passenger numbers, and the impact of the growth of the cruise industry on the environment, the paper highlights the need for regulations and innovation. Emissions of greenhouse gasses and air pollutants from cruise ships contribute to global warming and air pollution in coastal areas. Increased energy, resource and water consumption by cruise ships can also have negative environmental consequences. Therefore, it is important to adopt a sustainable approach to cruise tourism that minimizes its negative impact on the environment. This includes the use of advanced technologies for wastewater treatment, regulations to limit the discharge of pollutants into the sea, and changes in ship design to reduce resource consumption and emissions.