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.

Latest News

View all news

As the country mourns the death of Her Majesty The Queen, we reflect on the close relationship enjoyed between The...

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

Fact or Fiction

You can ask whether your relative used to work at MI5
loader