No. 91 Group RAF No. 91 (Operational Training) Group No. 91 (Bomber OTU) Group
Royal Air Force Ensign
Active	11 May 1942 - 1 May 1947
Country	United Kingdom
Branch	Royal Air Force
Type	Royal Air Force group
Role	Controlled Bomber OTU's
Part of	RAF Bomber Command
Last base	Morton Hall, Swinderby

No. 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. 6 Group RAF. 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. 21 Group RAF on 1 May 1947.^[2]

• February 1943 - HQ at Abingdon^[3]
  • No. 10 Operational Training Unit RAF at RAF Abingdon / RAF Stanton Harcourt with the Armstrong Whitworth Whitley V
  • No. 15 Operational Training Unit RAF at RAF Harwell / RAF Hampstead Norris with the Vickers Wellington Ic
  • No. 19 Operational Training Unit RAF at RAF Kinloss / RAF Forres with the Armstrong Whitworth Whitley V
  • No. 20 Operational Training Unit RAF at RAF Lossiemouth / RAF Elgin with the Vickers Wellington I
  • No. 21 Operational Training Unit RAF at RAF Moreton-in-Marsh / RAF Edgehill with the Vickers Wellington I
  • No. 22 Operational Training Unit RAF at RAF Wellesbourne Mountford / RAF Gaydon with the Vickers Wellington I, III
  • No. 23 Operational Training Unit RAF at RAF Pershore / RAF Stratford with the Vickers Wellington I
  • No. 24 Operational Training Unit RAF at RAF Honeybourne / RAF Long Marston with the Armstrong Whitworth Whitley V

• February 1944 - HQ at Abingdon^[4]
  • No. 10 Operational Training Unit RAF at RAF Abingdon / RAF Stanton Harcourt with the Armstrong Whitworth Whitley V, VII
  • No. 15 Operational Training Unit RAF at RAF Harwell / RAF Hampstead Norris with the Vickers Wellington III, X
  • No. 19 Operational Training Unit RAF at RAF Kinloss / RAF Forres with the Vickers Wellington III, X
  • No. 20 Operational Training Unit RAF at RAF Lossiemouth / RAF Elgin with the Vickers Wellington III, X
  • No. 21 Operational Training Unit RAF at RAF Moreton-in-Marsh / RAF Enstone with the Vickers Wellington III, X
  • No. 22 Operational Training Unit RAF at RAF Wellesbourne Mountford / RAF Gaydon with the Vickers Wellington III, X
  • No. 23 Operational Training Unit RAF at RAF Pershore / RAF Stratford with the Vickers Wellington III, X
  • No. 24 Operational Training Unit RAF at RAF Honeybourne / RAF Long Marston with the Vickers Wellington III, X

• February 1945 - HQ at Abingdon^[5]
  • No. 10 Operational Training Unit RAF at RAF Abingdon with the Vickers Wellington X
  • No. 19 Operational Training Unit RAF at RAF Kinloss with the Vickers Wellington X
  • No. 20 Operational Training Unit RAF at RAF Lossiemouth /RAF Elgin with the Vickers Wellington X
  • No. 21 Operational Training Unit RAF at RAF Moreton-in-Marsh / RAF Enstone with the Vickers Wellington X
  • No. 22 Operational Training Unit RAF at RAF Wellesbourne Mountford / RAF Gaydon with the Vickers Wellington III, X
  • No. 24 Operational Training Unit RAF at RAF Honeybourne / RAF Long Marston with the Vickers Wellington X
  • No. 27 Operational Training Unit RAF at RAF Lichfield / RAF Church Broughton with the Vickers Wellington X
  • No. 30 Operational Training Unit RAF at RAF Gamston / RAF Hixon with the Vickers Wellington III, X

• Falconer, J (2012). RAF Airfields of World War 2. UK: Ian Allan Publishing. ISBN 978-1-85780-349-5.
• Sturtivant, R; Hamlin, J; Halley, J (1997). Royal Air Force flying training and support units. UK: Air-Britain (Historians). ISBN 0-85130-252-1.