The IMH within its scope of competence intensively focuses on the development of international cooperation. In line with a long-term plan of the international activates it successfully develops the cooperation with some partner organizations:
On a multilateral basis the IMH is engaged in cooperation within the Military History Working Group – MHWG) working under the Consortium of Defense Academies and institutes of the security studies of Partnership for peace. Since 2001 the IMH took active participation in series of international scientific conferences of the MHWG. (Bucharest – 2001, Prague – 2003, Budapest – 2004, Vienna – 2005, Kingston – 2007, Ljubljana – 2008, Bucharest – 2009, Warsaw – 2010, Belgrade – 2011, Vienna – 2012, Sofia – 2013, Bratislava – 2014, Athens – 2015, Ljubljana – 2016, Bucharest – 2017, Belgrade – 2018, Budapest – 2019
In 2006, the IMH organized (in cooperation with French Service Historique de la Defense) in Bratislava 6th International scientific conference that turned out to be the biggest in its previous 11 years long history, with regard to the number of the participating countries /18/, the number of the participants /67/, as well as the number of the works presented /30/.
In 2014, IMH organized (in cooperation with with the Center for Military History of the Royal Danish Defence College) 14th international scientific conference of the Euroatlantic Conflict Studies Working Group. International conference under title Change of Doctrines – Using the Past to fight the Present was held under auspices of minister of defence of Slovak Republic Martin Glváč. 40 historians and military experts out of 14 countries participated at the conference and 21 papers within 8 blocs were presented.