The subject of this paper is maritime passenger traffic in the Republic of Croatia. This is a special type of passenger transport that involves the organized transport of passengers and goods by sea on special ships. The aim of this paper is to analyze the basic determinants and the current state of maritime passenger traffic in the Republic of Croatia and the relationship of this traffic with sea passenger ports and to determine strategies for the development of maritime passenger traffic in the Republic of Croatia in the near future. The paper analyzes coastal liner passenger traffic, cruise passenger traffic, as well as ships that perform these types of passenger transport. The relationship of sea passenger traffic with sea passenger ports is also analyzed. The connection between sea passenger traffic and tourism is also emphasized. In this paper is also given an overview of the main findings and specific goals and measures adopted in the Transport Development Strategy of the Republic of Croatia (2017 - 2030). For the long-term development of maritime passenger traffic it is necessary to modernize and expand sea passenger ports, modernize the fleet of passenger ships and improve the connection of local and maritime public transport in order to facilitate travel for passengers.