| Third Army | |
|---|---|
&sq=Envato&lang=en&file=File:3rd_Army_WW1.svg) 3rd Army formation badge. | |
| Active | 1915–1919 |
| Country |  United Kingdom |
| Branch |  British Army |
| Type | Field army |
| Engagements | Battle of the Somme Battle of Arras Battle of Cambrai Battle of Passchendaele Battle of Amiens Hundred Days Offensive |
| Commanders | |
| Notable commanders | Edmund Allenby Sir Julian Byng |
The Third Army was a field army of the British Army during World War I that saw active service on the Western Front throughout the war.