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.
- Cabinet Office
- Capital for Enterprise Limited
- Care Quality Commission (CQC)
- Central Advisory Committee on Pensions and Compensation
- Central Bureau for Educational Visits and Exchanges
- Certification Officer for trade unions and employers' associations
- Charity Commission
- Child Benefit Office, Her Majesty's Revenue and Customs
- Child Support Agency (CSA) or Child Maintenance Service
- Children and Family Court Advisory and Support Service (CAFCASS)
- Civil Aviation Authority
- Civil Justice Council
- Coal Authority
- Commission on Human Medicines
- Commissioner for Victims and Witnesses
- Commissioners of Northern Lighthouses
- Committee on Climate Change
- Committee on Mutagenicity of Chemicals in Food, Consumer Products and the Environment
- Committee on Radioactive Waste Management
- Committee on Standards in Public Life
- Committee on Toxicity of Chemicals in Food, Consumer Products and the Environment
- Commonwealth Scholarship Commission in the United Kingdom
- Community rehabilitation companies
- Companies House
- Competition and Markets Authority
- Competition Service
- Construction Industry Training Board
- Consumer Council for Water
- Corporation of the Trinity House of Deptford Strond (Trinity House)
- Council for Science and Technology
- Court Funds Office
- Criminal Injuries Compensation Authority
- Crown Estate Office
- Crown Prosecution Service (only if you are a victim of crime, under the Victim's Code)