| 100th Brigade | |
|---|---|
| Active | 1914–1918, 1945–1946 |
| Allegiance | United Kingdom |
| Branch | Infantry |
| Part of | 33rd Division (United Kingdom) |
| Engagements | Western Front, War in Vietnam (1945–46) |
The 100th Brigade was a formation of the British Army founded during World War I. It was raised as part of the new army also known as Kitchener's Army and assigned to the 33rd Division. The brigade served on the Western Front. The brigade saw additional action during Britain's involvement in Vietnam following the Second World War.