GOV.UK
Apply to register as a British citizen:
Form B(OS)
Use this form to register as a British citizen if you are a:
- British overseas citizen
- British subject
- British protected person
- British national (overseas)
and have no other citizenship or nationality.
You cannot apply online if you live in the Channel Islands or on the Isle of Man. You should apply using the Channel Islands, Isle of Man form.
Before you apply
Before you begin, read the guidance to find out about eligibility.
How long it takes you to complete the application will depend on your particular circumstances. You will be able to save your application and come back to it at another time if you need to.
If you are inactive for 25 minutes you will be automatically logged out.
How we use your data
The Home Office will use the personal information you provide to consider your application. We may also share your information with other public and private sector organisations in the UK and overseas. For more detail please see the Privacy Notice for the Border, Immigration and Citizenship system. This also sets out your rights under the Data Protection Act 2018 and explains how you can access your personal information and complain if you have concerns about how we are using it.