MI5 - Security Service

Contact Us

Do you know something about a threat to national security, such as terrorism or espionage? Could you help to keep the community safe? If so, we want to hear from you.

To help us deal with your enquiry, please select below what you would like to do.

If your enquiry is to report a suspected threat or crime, please choose from the following links:

For other enquiries, please select one of the following links:


If your information relates to an imminent threat to life or property, please contact the police on 999 or the Anti-Terrorist Hotline on 0800 789 321


Please do not use this form to submit queries about the recruitment process or your application for a job at MI5. Please contact the Recruitment Office on 0845 450 2152 or careers@recruitmentoffice.org.uk who will be able to help you.

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