| 173rd (3/1st London) Brigade | |
|---|---|
| Active | 1915–19 1943–45 |
| Country |  United Kingdom |
| Branch | _Brigade&sq=&lang=&file=File:Flag_of_the_British_Army.svg){kind=small} Territorial Force |
| Type | Infantry |
| Size | Brigade |
| Part of | 58th (2/1st London) Division |
| Engagements | First World War: Arras Passchendaele German spring offensive Amiens Hundred Days Offensive Second World War: Operation Fortitude |
| Commanders | |
| Notable commanders | Brig-Gen Bernard Freyberg, VC |
The 173rd (3/1st London) Brigade was a formation of the British Army's Territorial Force that was raised in 1915. It was assigned to the 58th (2/1st London) Division and served on the Western Front during the First World War. Its number was used for a deception formation during the Second World War.