| No. 21 (Training) Group RAF | |
|---|---|
 | |
| Active | 1 April – 1 July 1918 12 April 1926 – 1 February 1934 1 December 1938 – 1 March 1955 |
| Disbanded | 1 March 1955 |
| Country |  United Kingdom |
| Branch |  Royal Air Force |
| Type | Royal Air Force group |
| Role | Military aviation training |
| Part of | RAF Training Command (December 1938 - May 1940) RAF Flying Training Command (May 1940 - March 1955) |
| Motto(s) | Latin: Ad Suam Quisque Operam ("To each his own work")[1] |
| Commanders | |
| Notable commanders | Air Vice Marshal Hugh Vivian Champion de Crespigny CB, MC, DFC |
No. 21 Group RAF (21 Gp) is a former Royal Air Force group that existed from April-July 1918; 1926-1934, a redesignation of No. 1 Group RAF; after which it was merged into Inland Area; and from 1938 to 1955.[2]
- ^ Air of Authority, Group nos 21 -29, accessed June 2020.