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The Royal United Services Institute for Defence and Security Studies

Registered charity 210639, on the register since 4 October 1962. The 1,041st largest charity in England and Wales by income.

What it says it does

RUSI is the UK's leading independent think tank on international defence and security. Its mission is to be an analytical research-led global forum for informing, influencing and enhancing public debate on a safer and more stable world.

In the charity's own words, as filed with the Charity Commission.

Its causes

Other Charitable Purposes

Where it works

City of Westminster

Check it yourself

Its entry on the Charity Commission register · its own website

Figures are the latest the charity has reported to the Charity Commission, current to 27 September 2026. How this site works.