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International Institute for Strategic Studies
The International Institute for Strategic Studies (IISS) is an international research institute or think tank focusing on defence and security issues. Since 1997, its headquarters have been at Arundel House in London. It has offices on four continents, producing data and research on questions of defence, security and global affairs, publishing publications and online analysis, and convening major security summits. The Guardian newspaper has described the IISS as ‘one of the world’s leading security think tanks.’
The current Director-General and Chief Executive is Bastian Giegerich while Sir John Chipman is the Executive Chairman.
The 2017 Global Go To Think Tank Index ranked IISS as the tenth-best think tank worldwide and the second-best Defence and National Security think tank globally; Think Tank Alert ranked it as the top, most-cited non-US-based think tank in 2025; while Transparify ranked it third-largest UK think tank by expenditure, but gave it its lowest rating, describing it as deceptive, on funding transparency.
The institute has worked with governments, defence ministries and global organisations such as NATO.
The IISS provides ‘strategic advice and political risk analysis to government and commercial clients’.
In 2011 the institute published the FARC files—documents captured from the Revolutionary Armed Forces of Colombia that shed light on the movement's inner workings.
The 2017 Global Go To Think Tank Index ranked the Shangri-La Dialogue as the best Think tank conference worldwide.
The Institute for Strategic Studies (ISS), as it was originally known, was founded in 1958, following a conference in January 1957, which gathered together the main voices interested in the nuclear issues of the day. Military historian Michael Howard chaired a group which recommended that ‘we should set up a body whose primary purpose should be the collection and dissemination of information about nuclear weapons and their implications for international relations...And so the Institute was born.’
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International Institute for Strategic Studies
The International Institute for Strategic Studies (IISS) is an international research institute or think tank focusing on defence and security issues. Since 1997, its headquarters have been at Arundel House in London. It has offices on four continents, producing data and research on questions of defence, security and global affairs, publishing publications and online analysis, and convening major security summits. The Guardian newspaper has described the IISS as ‘one of the world’s leading security think tanks.’
The current Director-General and Chief Executive is Bastian Giegerich while Sir John Chipman is the Executive Chairman.
The 2017 Global Go To Think Tank Index ranked IISS as the tenth-best think tank worldwide and the second-best Defence and National Security think tank globally; Think Tank Alert ranked it as the top, most-cited non-US-based think tank in 2025; while Transparify ranked it third-largest UK think tank by expenditure, but gave it its lowest rating, describing it as deceptive, on funding transparency.
The institute has worked with governments, defence ministries and global organisations such as NATO.
The IISS provides ‘strategic advice and political risk analysis to government and commercial clients’.
In 2011 the institute published the FARC files—documents captured from the Revolutionary Armed Forces of Colombia that shed light on the movement's inner workings.
The 2017 Global Go To Think Tank Index ranked the Shangri-La Dialogue as the best Think tank conference worldwide.
The Institute for Strategic Studies (ISS), as it was originally known, was founded in 1958, following a conference in January 1957, which gathered together the main voices interested in the nuclear issues of the day. Military historian Michael Howard chaired a group which recommended that ‘we should set up a body whose primary purpose should be the collection and dissemination of information about nuclear weapons and their implications for international relations...And so the Institute was born.’