Introduction to the Security Service

MI5's mission is to keep the country safe. For more than a century we have worked to protect the UK from a range of threats, whether it be from terrorism or hostile activity by states.

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Think you could work for MI5?

Put your memory and judgement skills to the test in the My MI5sion challenge. Can you crack our three secret tasks?


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The Social Mobility Foundation Index recognises the organisations that are taking the most action to ensure they are...

HRH The Princess Royal smiling at MI5 staff

On 27 October MI5 was honoured to receive a visit from HRH The Princess Royal to our London headquarters, Thames House.

Fact or Fiction

You can ask whether your relative used to work at MI5