Line shipping is of great importance for the Republic of Croatia. Line maritime passenger transport, i.e. the transport of passengers and vehicles by sea from one port to another, is organized on limited regional markets where continuous transport is required. In the Republic of Croatia, most lines are still operated mainly by Croatian shipping companies. The most significant among them is „Jadrolinija“ d.d. There are different organizational structures within the shipping company despite the clear definition of liner shipping. The changes depend on the size of the shipping company and the lines at its disposal. In order to present all the relevant facts and knowledge, this paper analyzes the subject of concept and division of maritime shipping, and will be shown all the factors of maritime passenger transport, especially in the area of Primorje Gorski kotar. In general, in maritime transport, great emphasis is placed on ports and port systems as the starting and ending points of passenger journeys. Therefore, the goal of this paper is to show the organization of port systems and the passenger market, types of liners, and to show leading liner companies such as Jadrolinija in the area of Primorje gorski kotar.