| XXI Corps | |
|---|---|
&sq=&lang=&file=File:XXI_Corps_WW1.svg) XXI Corps formation badge. | |
| Active | 12 August 1917–1919 |
| Country |  United Kingdom |
| Branch | &sq=&lang=&file=File:Flag_of_the_British_Army.svg){kind=small} British Army |
| Type | Army Corps |
| Part of | Egyptian Expeditionary Force |
| Engagements | World War I |
| Commanders | |
| Notable commanders | Lt-Gen Sir Edward Bulfin |
The XXI Corps was an Army Corps of the British Army during World War I. The Corps was formed in Palestine in August 1917 under the command of Lieutenant General Edward Bulfin.[1] It formed part of the Egyptian Expeditionary Force (EEF) and served in the Sinai and Palestine Campaign. At the Battle of Sharon it fought what has been described as 'one of the most overwhelmingly successful operations of the war'[2] and 'a precursor to the modern Blitzkrieg.'[3] It then carried out remarkable march up the coast of modern-day Lebanon as the war came to an end.