Check the list below to see if the service you want to complain about is included. You can also find out more about what we can and cannot help with.
If you have any questions, call us on 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