9 Group RAF (9 Gp) was a group of the Royal Air Force, which existed over two separate periods, initially at the end of the First World War, and latterly during the Second World War when its role was air defence.

As 1940 wore on, the need for another Group headquarters to control fighter operations became more and more apparent.

9 Group was formed in September 1940 to cover North West England and Northern Ireland.

It was based at RAF Barton Hall[1] and initially only controlled No.

[5] 9 Group also supplied the staff that were trained by Robert Watson-Watt, the inventor of radar, to operate the Chain Home early warning system.