This page contains a list of all the UK government departments and other public organisations we can investigate.
You can also use our complaint checker tool 'Can we look into your complaint?' to find out if we can investigate the organisation you want to complain about. It will take you to the correct complaint form.
If you are still not sure, this page will tell you what we can and can't help with or you can ring us 0345 015 4033.
- Office for Budget Responsibility
- Office for Environmental Protection
- Office for Nuclear Regulation
- Office of Communications (Ofcom)
- Office of Public Sector Information
- Office of Qualifications and Examinations Regulation
- Office of Rail and Road or Office of Rail Regulation
- Office of the Children's Commissioner
- Office of the Immigration Services Commissioner
- Office of the Public Guardian
- Office of the Regulator of Community Interest Companies
- Office of the Secretary of State for Scotland
- Official Receiver
- Official Solicitor to the Supreme Court
- Ofgem (Office of Gas and Electricity Markets)
- Ofqual (Office of Qualifications and Examinations Regulation)
- Ofsted (Office for Standards in Education, Children's Services and Skills)
- Ofwat (Water Services Regulation Authority)
- Oil and Pipelines Agency
- Ordnance Survey