- The Act of ratification of the North Atlantic Treaty (NN MU 3 2009)
- Security Agreement between the Republic of Croatia and the North Atlantic Treaty Organization (Official Gazette International Agreement 14/03)
- Agreement between the Republic of Croatia and the European Union on security procedures for the exchange of classified information (Official Gazette International Agreement 9/06)
- Security Arrangements between the Office of the National Security Council (UVNS) of the Republic of Croatia, the EU Council general Secretariat Security Office (GSCSO) and the European Commission Security Directorate (ECSD) for the protection of classified information exchanged between the Republic of Croatia and the EU (October, 2007)
- Agreement between the Government of the Republic of Croatia and the Government of the Republic of Bulgaria on mutual protection and exchange of Classified Information
- Agreement between the Government of the Republic of Croatia and the Council of ministers of the Republic of Albania on mutual protection of Classified Information
- Agreement between the Government of the Republic of Croatia and the Government of the Republic of Macedonia on exchange and mutual protection of Classified Information
- Agreement between the Government of the Republic of Croatia and the Government of the Republic of Estonia on mutual protection of Classified Information
- Agreement between the Parties to the North Atlantic Treaty for the Security of Information
- Agreement between the Government of the Repulic of Croatia and the Government of the Czech Republic on mutual protection of classified information
- Agreement between the Government of the Republic of Croatia and the Government of the Slovak Republic on mutual protection of classified information
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Government of the Slovak Republic on mutual protection of classified information (Official Gazette, International Agreements 6/10)
- Agreement between the Parties to the North Atlantic Treaty for Co-operation regarding Atomic Information with Secret Technical Annex to the Agreement between the Parties to the North Atlantic Treaty for Co-operation regarding Atomic Information and Confidential Security Annex to the Agreement
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Government of the Czech Republic on mutual protection of classified information (Official Gazette, International Agreements 8/11)
- Agreement between the Government of the Republic of Croatia and the Government of the French Republic on mutual protection of classified information (Official Gazette, International Agreements 7/11)
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Government of the French Republic on mutual protection of classified information (Official Gazette, International Agreements 12/11)
- Agreement between the Government of the Republic of Croatia and the Government of the Republic of Slovenia on mutual protection of classified information (Official Gazette, International Agreements 15/11)
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Government of the Republic of Slovenia on mutual protection of classified information (Official Gazette, International Agreements 1/12)
- Agreement between the Government of the Republic of Croatia and the Government of the Kingdom of Sweden on the Exchange and Mutual Protection of Classified Information (Official Gazette, International Agreements 4/14)
- Agreement between the Government of the Republic of Croatia and the Government of the Grand Duchy of Luxembourg on Mutual Protection of Classified Information (Official Gazette, International Agreements 4/14)
- Agreement between the Government of the Republic of Croatia and the Government of the Republic of Finland on Mutual Protection of Classified Information (Official Gazette, International Agreements 4/14)
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Government of the Republic of Finland on Mutual Protection of Classified Information (Official Gazette, International Agreements 4/15)
- Agreement between the Government of the Republic of Croatia and the Government of Hungary on the Exchange and Mutual Protection of Classified Information (Official Gazette, International Agreements 2/17)
- Agreement between the Government of the Republic of Croatia and the Government of the Republic of Poland on Mutual Protection of Classified Information (Official Gazette, International Agreements 8/17)
- Agreement between the Government of the Republic of Croatia and the Government of Romania on Mutual Protection of Classified Information (Official Gazette, International Agreements 13/17)
- Agreement between the Government of the Republic of Croatia and the Council of Ministers of Bosnia and Herzegovina on Mutual Protection of Classified Information (Official Gazette, International Agreements 1/18)
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Council of Ministers of Bosnia and Herzegovina on Mutual Protection of Classified Information (Official Gazette, International Agreements 3/18)
- Agreement between the Government of the Republic of Croatia and the Government of the Republic of Lithuania on Mutual Protection of Classified Information (Official Gazette, International Agreements 1/18)
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Government of the Republic of Lithuania on Mutual Protection of Classified Information (Official Gazette, International Agreements 1/18)
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Government of Romania on Mutual Protection of Classified Information (Official Gazette, International Agreements 2/18)
- Agreement between the Government of the Republic of Croatia and the Austrian Federal Government on the Exchange and Mutual Protection of Classified Information (Official Gazette, International Agreements 1/19)
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Austrian Federal Government on the Exchange and Mutual Protection of Classified Information (Official Gazette, International Agreements 3/19)
- Agreement between the Government of the Republic of Croatia and the Government of the Kingdom of Norway on Mutual Protection of Classified Information (Official Gazette, International Agreements 1/19)
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Government of the Kingdom of Norway on Mutual Protection of Classified Information (Official Gazette, International Agreements 3/19)
- Agreement between the Government of the Republic of Croatia/Office of the National Security Council and the Government of the State of Israel/the Israeli Ministry of Defence on Protection of Classified Information (Official Gazette, International Agreements 8/19)
- Agreement between the Government of the Republic of Croatia and the Government of the Italian Republic on Exchange and Mutual Protection of Classified Information (Official Gazette, International Agreements 10/19)
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Government of the Italian Republic on Exchange and Mutual Protection of Classified Information (Official Gazette, International Agreements 1/20)
- Agreement between the Government of the Republic of Croatia and the Government of the United States of America Concerning Security Measures for the Protection of Classified Information (Official Gazette, International Agreements 1/21)
- Agreement between the Republic of Croatia and the Portuguese Republic on Mutual Protection of Classified Information (Official Gazette, International Agreements 1/21)
- Notification on coming into effect of the Agreement between the Republic of Croatia and the Portuguese Republic on Mutual Protection of Classified Information (Official Gazette, International Agreements 2/21)
- Agreement between the Government of the Republic of Croatia and the Government of the Kingdom of Spain on Mutual Protection of Classified Information (Official Gazette, International Agreements 2/21)
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Government of the Kingdom of Spain on Mutual Protection of Classified Information (Official Gazette, International Agreements, 1/2022)
- Agreement between the Government of the Republic of Croatia and the Government of the Republic of Cyprus on the Exchange and Mutual Protection of Classified Information (Official Gazette, International Agreements, 1/2022)
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Government of the Republic of Cyprus on the Exchange and Mutual Protection of Classified Information (Official Gazette, International Agreements 1/2023)
- Agreement between the Government of the Republic of Croatia and the Government of the Federal Republic of Germany on the Exchange and Mutual Protection of Classified Information (Official Gazette, International Agreements, 9/2023)
- Notification on coming into effect of the Agreement between the Government of the Republic of Croatia and the Government of the Federal Republic of Germany on the Exchange and Mutual Protection of Classified Information (Official Gazette, International Agreements 11/2023)
National Security Authorities
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| Bulgaria | Republic of Macedonia | Estonia | Czech Republic |
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| Slovakia | France | Slovenia | Finland |
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| Sweden | Luxemburg |
International Institutions
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| NATO | EU |
