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What we do

We support the Prime Minister and Deputy Prime Minister, and ensure the effective running of government. We are also the corporate headquarters for government, in partnership with HM Treasury, and we take the lead in certain critical policy areas.

CO is a ministerial department, supported by 16 agencies and public bodies.

Read more about what we do

We work on these topics

  1. Government efficiency, transparency and accountability

    Openness and transparency can save money, strengthen people's trust in government and encourage greater public participation in decision-making. Read more

  2. Community and society

    The government is working to help people take action to solve their own problems and create strong, attractive and thriving neighbourhoods. Read more

  3. National security

    The government works to identify the most pressing risks to our security, and put in place the ways and means to address them. Read more

  4. Foreign affairs

    The government works to promote and protect UK interests internationally, and works with other countries to make progress on issues of mutual concern like trade, climate change, security and economic development. Read more

  5. Defence and armed forces

    The government works to defend the UK against threats to our national security, and to defend the interests of the UK and our allies in the world. Read more

  6. Public safety and emergencies

    The government provides funding and support for local emergency services including the police, fire and ambulance services, and sets national standards to make sure they are effective and consistent. Read more

Our policies

See all of our policies


Our announcements

Our consultations

Our publications

See all of our publications

Our statistics

Our ministers

Our management

Contact CO

General enquiries

Correspondence Team
70 Whitehall


Efficiency and reform enquiries

ERG Service Desk
Cabinet Office
Roseberry Court
St Andrews Business Park


Freedom of information requests

FOI Team
Cabinet Office
Room 3.32
1 Horse Guards Road


Media enquiries

0207 276 0400/2234 Efficiency and Reform Group

020 7276 0432 Constitutional and political reform

020 7276 1196 Propriety, Civil Service and corporate

07699 113300 (quote reference no. 721338) Out of hours

High profile groups within CO

Corporate information

Read about the types of information we routinely publish in our Publication Scheme. Our Personal information charter explains how we treat your personal information.