In international politics, defence diplomacy refers to the pursuit of foreign policy objectives through the peaceful employment of defence resources and capabilities.
 Origin of the Concept
Defence diplomacy as an organizing concept for defence-related international activity has its origin in post-Cold War reappraisals of Western defence establishments, led by the United Kingdom Ministry of Defence, and was a principle “used to help the West come to terms with the new international security environment.” While the term originated in the West, the conduct of defence diplomacy is by no means confined to Western countries.
 Development of Defence Diplomacy
While there is not yet a broadly accepted definition of defence diplomacy, it can be understood as the peaceful application of resources from across the spectrum of defence, to achieve positive outcomes in the development of a country’s bilateral and multilateral relationships. "Military diplomacy" is a sub-set of this, tending to refer only to the role of military attachés and their associated activity. Defence diplomacy does not include military operations, but subsumes such other defence activity as international personnel exchanges, ship and aircraft visits, high level engagement (e.g. Ministers and senior defence personnel), bilateral meetings and staff talks, training and exercises, regional defence forums (e.g. Shangri-la Dialogue, Halifax Forum), outreach, confidence and security building measures, and non-proliferation activities.
The United Kingdom identified defence diplomacy as one of the military’s eight defence missions, and aims to “dispel hostility, build and maintain trust and assist in the development of democratically accountable armed forces” to make a “significant contribution to conflict prevention and resolution.” Defence diplomacy is often developed and implemented in close coordination with the foreign and development ministries to ensure coherence and focus across government.
Major General Ng Chee Khern, Air Force Chief of the Republic of Singapore, summed it up thus: "In defence diplomacy, we seek to develop mutually beneficial relationships with friendly countries and armed forces to contribute to a stable international and regional environment."
Defence diplomacy is often associated with conflict prevention  and security sector reform. It is distinct from the concept of gunboat diplomacy, which is generally understood to be motivated by a desire to intimidate potential adversaries.
- Koerner, Wolfgang. Security Sector Reform: Defence Diplomacy. Library of Parliament, Parliamentary Information and Research Services PRB 06-12E. pp. 2.
- See, for example, http://www.indianexpress.com/news/defence-diplomacy/721801/ or http://www.bt.com.bn/news-national/2010/06/01/keep-defence-diplomacy-alive-hm
- For example, the Conference of Defence Ministers of the Americas http://www.cdmamericas.org/PublicPages/Home.aspx
- For example, the Canada-US Permanent Joint Board on Defence http://www.forces.gc.ca/site/news-nouvelles/news-nouvelles-eng.asp?cat=00&id=298
- UK Ministry of Defence Policy Paper, “Paper no. 1: Defence Diplomacy”, pp. 2
- Major General Ng Chee Khern, Chief of Air Force, Republic of Singapore, cited in Pointer 34:1 (2008)