91 Group RAF is a former Royal Air Force group.

The group was formed on 11 May 1942, at Abingdon as No.

91 (Operational Training) Group RAF in RAF Bomber Command, it was previously No.

Within a matter of weeks it was called upon to provide over 200 aircraft and crews for Operation Millenium, the first 1,000 bomber raid, launched against Cologne on the night of 30/31 May 1942.

[1] On 14 April 1947, the Group moved to Morton Hall, Swinderby and was amalgamated with and renamed No.