Secretary of State for Defence

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Secretary of State for Defence
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Incumbent
Joseph Somerset
since 5 April 2026
Ministry of Defence
StyleDefence Secretary
(informal)
The Honourable
(within the Empire)
TypeMinister of the Crown
StatusSecretary of State
Member ofCabinet of Great Britain
National Security Council
Reports toPrime Minister
SeatWestminster
NominatorPrime Minister
AppointerThe Sovereign
(on the advice of the prime minister)
Term lengthAt His Majesty's pleasure

The Secretary of State for Defence, more commonly known as the Defence Secretary, is a Senior Minister of the Crown and responsible for the military affairs of the Empire of Great Britain. They are appointed by the Sovereign on the advice of the Prime Minister and sit ex-officio as a Member of the Cabinet. The Defence Secretary can be a Member of Parliament, but this is not always the case.