The competitiveness of container seaports is very important for their ability to attract and retain traffic in the global market. Analysis of the two key Adriatic ports, the Port of Rijeka and the Port of Koper, identifies their strengths, weaknesses and opportunities for improvement. The port of Rijeka, the largest Croatian port, has a strategic advantage due to its position on the Adriatic, which provides easy access to Central and Eastern Europe. Its competitiveness is limited by insufficiently developed infrastructure, especially railway connections, and administrative obstacles which slow down operations. Despite the plans for modernization, the key is fast and efficient implementation of the plans. On the other hand, the port of Koper in Slovenia has the advantage of a well – developed infrastructure and strong rail connections with key European markets. The port of Koper is continuously expanding its capacity and modernizing, which makes it a very competitive port. Although it faces the challenges of saturated capacity and the need for further expansion in order to maintain its position in the market. The competitiveness of these ports depends on their ability to adapt to global markets, modernize infrastructure and improve operational efficiency.