The Cabinet Office Briefing Rooms (COBR) are meeting rooms in the Cabinet Office in London. These rooms are used for committees which co-ordinate the actions of government bodies in response to national or regional crises, or during overseas events with major implications for the UK. It is popularly referred to as COBRA.

The Cabinet Office is a ministerial department of the Government of the United Kingdom. It is responsible for supporting the prime minister and Cabinet. It is composed of various units that support Cabinet committees and coordinate the delivery of government objectives via other departments. As of December 2021, it had over 10,200 staff, mostly civil servants, some of whom work in Whitehall. Staff working in the Prime Minister's Office are part of the Cabinet Office.