A newbuilding dry-docking is a part of the shipbuilding process, which is carried out by the completion of the newbuilding vessel, and represents a complex assignment in many respects, such as: dry-docking activities organization, establishment of the living and working conditions for the crew enlisted and making the vessel seaworthy for her first sea voyage. Besides the technical complexity of the activities, the dry-docking needs to be completed in the shortest possible time period, with optimal cost and quality, thus making the vessel ready for the next five year service period without subsequent drydocking. The dry-docking period could be used as a period for the completion of delayed works on board of the vessel. A process approach is going to be used in the dry-docking process description using process inputs which are then transformed into process outputs. The multi-criteria model using the Data Envelopment Analysis methodology has been utilized in order to measure the newbuilding dry-docking relative efficiency. The Data Envelopment Analysis is a non-parametric method based on the Linear Programming using inputs and outputs derived from the researched process, giving the efficiency amount to all the vessels, and sorting out the benchmark vessels, which become the peers for the inefficient vessels. The improvement needed for the inefficient vessels is presented in absolute and relative values. The researched vessels set consists of five vessel types and thirty-four vessels in total. The vessels in this research were dry-docked in five domestic and foreign repair shipyards. The inputs consist of data related to gross tonnage, steelwork and coating work, as well as the relative crew number. The outputs comprise dry-dock rent and services cost, steelwork cost, coating cost, vessel transfer and delays costs. The dry-docking efficiency analysis and dry-docking benchmarking have been carried out using the five Data Envelopment Analysis models. The efficiency measurement results related to the dry-docking season, dry-docking duration and total cost have been presented in this thesis.