Form

Application to register as a British citizen: form B(OS)

Form to apply to register as a British citizen if you have certain other types of British nationality.

Documents

Application for registration as a British citizen by a British overseas citizen: form B(OS)

This file may not be suitable for users of assistive technology. Request an accessible format.

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alternativeformats@homeoffice.gsi.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Guidance on registering as a British citizen by a British Overseas citizen, British subject, British protected person, British National (Overseas) who has no other citizenship or nationality using form B(OS)

This file may not be suitable for users of assistive technology. Request an accessible format.

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email alternativeformats@homeoffice.gsi.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

Details

You can now apply online. The online form will ask questions that are relevant to you based on the information you enter. You can edit and download the application before it is submitted.

Use this form if you are a British Overseas citizen, British subject, British protected person, or British National (Overseas) and have no other citizenship or nationality. You should also read the guidance notes.

Get help using a computer to apply online

You can get help completing an online immigration form if you do not feel confident using a computer or do not have access to one.

You can get help with:

  • accessing a computer or the internet
  • finding the right information on GOV.UK

You cannot use this service to get advice on:

  • whether you’re eligible to apply
  • what information to put in your application
  • an application you’ve already made

Access the Assisted Digital Service page for further information and contact details.

Published 1 June 2010
Last updated 19 July 2018 + show all updates
  1. Updated with link to new online application form.
  2. Updated guidance.
  3. Revised guide with biometric details and where to send applications
  4. Updated guidance and form
  5. First published.