Royal United Services Institute

The Royal United Services Institute (RUSI) is a United Kingdom‑based organisation that conducts research and analysis on defence, security and international affairs. It produces policy reports, briefing papers and scholarly publications that are aimed at informing government officials, military leaders and academic audiences. RUSI also organises conferences, seminars and public events where experts discuss contemporary security challenges. Its work spans topics such as military strategy, cyber security, non‑proliferation and regional security dynamics.

Founded in 1831, RUSI claims to be the oldest defence and security think tank in the world. It maintains a headquarters in London and operates with a staff of researchers, fellows and support personnel. The institute’s output is distributed through its website, journals and direct briefings to policymakers.

RUSI distinguishes itself by its independent status and its long‑standing relationship with the British armed forces, while remaining non‑governmental. Its researchers are recognised for expertise in areas such as defence procurement, counter‑terrorism and strategic studies. The institute’s reputation is built on producing evidence‑based analysis that is cited in parliamentary debates and international forums.

Structurally, RUSI is a registered charity governed by a royal charter and overseen by a board of trustees. It does not belong to any parent corporation or government department, relying instead on membership fees, charitable donations and project‑specific funding for its activities.