| Fourth Army | |
|---|---|
&sq=Facebook&lang=en&file=File:4th_Army_WW1.jpg) 4th Army formation badge. | |
| Active | First World War (1916–1918) Second World War (1943–1944, as deception only) |
| Country |  United Kingdom |
| Branch |  British Army |
| Type | Army |
| Engagements | First World War |
| Commanders | |
| Notable commanders | Sir Henry Rawlinson |
The Fourth Army was a field army that formed part of the British Expeditionary Force during the First World War. The Fourth Army was formed on 5 February 1916 under the command of General Sir Henry Rawlinson to carry out the main British contribution to the Battle of the Somme.