The article raises the topic of Croatia’s place and role in the Three Seas Initiative (3SI). The aim of the article is: (a) showing the relationship of the main political forces to the 3SI; (b) an indication of the scale of interest in this project from national analytical centers; (c) analysis of the reasons for involvement or reserve and distance to the Three Seas Initiative; (d) analysis of the role attributed or expected in the Three Seas Initiative; (e) analysis of the perception of other states – participants of the Three Seas Initiative; (f) analysis of integration projects competing or complementary to the Three Seas Initiative which are or may be of importance for Croatia; (g) to show the attitude of the government in Zagreb to the execu-tive/intergovernmental dimension being developed; (h) an indication of the threats and opportunities identified by the Croatian authorities for the Three Seas Initiative; (i) analysis of the perception of 3SI’s relations with the European Union; (j) analysis of the perception and assessment of the policy of third countries towards the Three Seas Initiative (from the Zagreb perspective). The structure of the article follows the above-mentioned goals.