One of the most important decisions that business owners and managers face is the question of which organizational structure to use for a project. Each project has its unique characteristics and many different factors should be taken into account when designing the organizational structure. The aim of this diploma thesis is to identify the main factors and characteristics of organizational structures in projects and to implify on advantages and disadvantages of each structure in order to determine the most optimal type, with an emphasis on the specificity of the project organization. There are three types of organizational structures in project management: functional, matrix, and project. A crucial part of any organizational structure is building a project team. This paper describes in detail the elements that a team is made of and the factors that influence the composition of a high-quality and professional project team. The fundamental analysis of the work refers to the company Wilhelmsen Ship Management Ltd. through which the organizational structure is interpreted in terms of the project and functions that exist within it.