The significance of project controlling as a concept of technical and advisory support to project management, which increases the effectiveness and efficiency of project implementation by applying project controlling tools, primarily stems from the increased success in the implementation of project orders. Projects are activities that are different from routine activities - they are unique and time limited. The actuality and its importance in the modern economy is increasingly pronounced. In addition to the professional paper "Projektni kontroling" written by Ph.D. Osmanagić Bedenik published in the journal “Računovodstvo, revizija i financije“ (No. 7, 2008), in Croatia there are no other significant works on this subject. Therefore, it can be assumed that project controlling in Croatia is a perspective in development. This thesis, aims to define the concept of project controlling by describing the tasks, responsibilities, methods and techniques of project controlling, as well as ways of integration into organizational structure of the company. This thesis also aims to analyze the role of project controlling in the process of project implementation of a specific Croatian company. After that it suggests the possibilities of improving the role of project controlling. The improvement suggestions are based on the theoretical knowledge described in the thesis, taking into account the specificity and complexity of the environment of the analyzed company. As improvement suggestions of the implementation of project controlling, it is stated to establish a new decentralized project controlling unit and to define the role of project controlling in accordance with the modern concept, which implies the role of project controlling as an assistant in the project team, who supports and advises the project manager throughout the whole project implementation period. This would contribute to the increase of the transparency of the achieved success.