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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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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MI5 Director General Ken McCallum and FBI Director Chris Wray warn of growing threat posed by Chinese Communist Party.

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This February MI5 is proud to be marking LGBT+ History Month. In keeping with this year’s 'art' theme,...

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You can ask whether your relative used to work at MI5