The aim of this paper was to thoroughly investigate the concept of multimodal transport, which is based on the use of various modes of transport, including road, rail, sea, and air transport, in order to achieve greater efficiency and cost-effectiveness. This approach contributes to the acceleration of industrial development, promotes containerization, and the application of new technologies, which in turn requires appropriate legal regulation of the relationships between the key actors in the transport sector. Special attention was given to the maritime component of multimodal transport, which plays a key role in international trade by enabling faster and safer "door-to-door" delivery of goods. Modern trade requires timely and efficient delivery, and the documents related to multimodal transport serve as essential documents confirming the contract between the operator and the shipper. The key to safety and responsibility in this process lies in alignment with unified legal standards, minimizing the risk of misunderstandings, especially concerning liability for any damage. Although many international efforts have been made to unify the legal framework for multimodal transport, including the Hague and Hamburg Rules, a universally accepted convention still does not exist, creating legal ambiguities, particularly in the maritime segment. The Rotterdam Rules, enacted to address the challenges of modern international transport, represent a significant step towards the unification of the legal framework. Although the networked system of responsibility they introduce has faced criticism for its complexity and lack of clarity regarding responsibilities in specific stages of transport, such as storage and transshipment, the Rotterdam Rules still strive for modernization of the sector. Considering its strategic location on the Adriatic Sea, Croatia has significant potential for further development of multimodal transport. However, the current legal framework and infrastructure are still not at a satisfactory level. The lack of a consistent transport policy and long-term strategy makes it difficult for Croatia to fully integrate into European and global transport flows. In conclusion, despite the progress made in regulating international transport, further revision and adjustment of legal frameworks are necessary to ensure greater legal clarity and efficiency, especially in the multimodal transport segment.