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The Royal United Services Institute For Defence And Security Studies

Also known as: The Royal United Services Institute for Defence Studies, R U S I

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.

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Activities & Mission

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.

Areas of Operation

Where this charity is registered to operate, as self-declared to the Charity Commission. These are regulatory classifications, not a list of active programmes, and don't necessarily indicate fundraising activity in each location.

Local Authority

City Of Westminster

Financial Information

Latest Income
£16,616,542
Latest Expenditure
£16,561,198

Financial Efficiency

Program Ratio 93.5%
% of income going directly to charitable activities
Overall Efficiency 93.9%
% of expenditure going to programs (vs overhead)
Administrative Ratio 6.9%
Overhead (fundraising + governance) as % of total expenditure

Latest Financial Breakdown

Income Sources

Donations & Legacies £1,629,432
Charitable Activities £14,151,732
Other Trading £830,039
Investments £5,339
Other Income £0

Expenditure Categories

Charitable Expenditure £15,544,469
Raising Funds £1,016,729
Governance £131,585
Grants to Institutions £0
Other Expenditure £0

Financial Trend

Annual Returns

As filed with the Charity Commission for England and Wales. Most recent filing covers the financial year ending 2025.

Financial YearIncomeExpenditureCharitable SpendingNet AssetsReservesStaff
2025
£16,616,542
£16,561,198£15,544,469£16,946,416£4,998,600113 / 0
2024
£18,715,927
£18,172,618£17,755,666£17,836,548£6,694,978125 / 0
2023
£16,800,162
£15,991,716£15,643,427£8,539,593£5,800,871127 / 0
2022
£15,367,601
£11,848,010£11,539,711£12,192,945£6,667,364115 / 0
2021
£11,130,492
£9,393,083£9,043,602£13,599,746£9,151,96093 / 0

Staff column shows: Employees / Volunteers

Frequently asked questions about The Royal United Services Institute For Defence And Security Studies

What does The Royal United Services Institute For Defence And Security Studies do?

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.

How much income did The Royal United Services Institute For Defence And Security Studies report in 2025?

The Royal United Services Institute For Defence And Security Studies reported total income of £16.62m and reported expenditure of £16.56m for the financial year ending 2025, based on the most recent annual return filed with the Charity Commission.

When was The Royal United Services Institute For Defence And Security Studies registered as a charity?

The Royal United Services Institute For Defence And Security Studies was registered with the Charity Commission for England and Wales on 4 October 1962 as charity number 210639. It has been registered for 64 years.

Who runs The Royal United Services Institute For Defence And Security Studies?

The Royal United Services Institute For Defence And Security Studies is governed by a board of 13 trustees. The chair of trustees is The Duke of Wellington Charles Wellesley OBE DL. Trustees are legally responsible for the charity's governance and are listed in full on its profile.

Where does The Royal United Services Institute For Defence And Security Studies operate?

The Royal United Services Institute For Defence And Security Studies operates across 4 areas: Belgium, Kenya, United States and City Of Westminster.

Is The Royal United Services Institute For Defence And Security Studies a registered charity?

Yes — The Royal United Services Institute For Defence And Security Studies is a registered charity in England and Wales, charity number 210639.

Details

Address
RUSI
WHITEHALL
LONDON
SW1A 2ET
Website
www.rusi.org
Registration Date
4 October 1962
Status
Registered

Registry Information

Organisation Number
210639
Charity Number
210639

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Trustees

The Duke of Wellington Charles Wellesley OBE DL Chair
Admiral Sir Philip Andrew Jones GCB DL
Baroness Poppy Gustafsson CBE
Divyata Ashiya
General Sir Nicholas Patrick Carter
Janice Elizabeth Hall
Laurence Stephen Geller CBE
Lord Peter Forbes Ricketts
Also governs 1 other charity
Rt Hon Amber Augusta Rudd
Rt Hon John Whitaker Straw
Also governs 1 other charity
Sharon Thorne
Sir Alexander Younger KCMG
Suzanne Elizabeth Raine
Also governs 2 other charities

Also Known As

  • The Royal United Services Institute for Defence Studies
  • R U S I

Data & trust

Register data refreshed
14 May 2026
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