Passenger flows are the flows of people (passengers) and their baggage that travel because of different motives and needs to travel on certain traffic directions. The basic characteristics of passenger flows are: direction, intensity and type of passenger flow. Liner passenger transport is one of the basic types of maritime-passenger traffic. The main characteristic of liner shipping is that the transport of the passenger is performed between the departure and destination ports according to the pre-determined line of navigation. This paper analyzes the flows of passengers in liner shipping in the Republic of Croatia, which includes analyzing the intensity of the passenger flows on the state lines and analyzing the intensity of the flows in the main ports for liner shipping in the Republic of Croatia. Accordingly, the subject of this paper is the flow of passengers in liner shipping in the Republic of Croatia. Since the Republic of Croatia is a tourism land, it is of particular importance that the islands are well connected with the mainland. In addition to linking the islands to the mainland, the importance of state-owned shipping lines is reflected in the possibility of achieving better quality of life for residents of the island. In addition to the mentioned analysis of the flows of passengers in liner shipping in the Republic of Croatia, the flows of passengers to the port environment are analyzed. Ports represent the relevant sea line junctions and which, as such, have to respond to the needs of liner passenger traffic.