The summit is expected to focus on the region's security and stability as well as NATO enlargement to this part of Europe.
The hosts of this traditional international gathering are Croatia's Parliament Speaker Vladimir Seks and Prime Minister Ivo Sanader.
Those expected to attend include NATO Secretary-General Jaap de Hoop Scheffer, Council of Europe Secretary-General Terry Davis, US Assistant State Secretary Dan Fried, former US President Jimmy Carter's national security advisor Zbigniew Brzezinski, former Turkish Foreign Minister Hikmet Cetin, Georgian President Mikheil Saakashvili, Prime Ministers Sali Berisha of Albania, Robert Fico of Slovakia, Calin Popescu Tariceanu of Romania, Nikola Gruevski od Macedonia, Vasil Tarlev of Moldova and Agim Ceku of Kosovo, Deputy Premiers Gordana Djurovic of Montenegro and Alexandar Vondra of the Czech Republic, the Italian premier's special envoy Famiano Crucianelli, Slovene Defence Minister Karl Erjavec, Foreign Ministers Carl Bildt of Sweden, Miguel Angel Moratinos of Spain and Petras Vaitiekunas of Latvia, and Japanese Deputy Foreign Minister Midori Matushima.
The premiers of the US-Adriatic Charter countries - Sanader, Berisha and Gruevski - expect the NATO secretary-general to encourage them with regard to joining the alliance.