| Unit Name: | Imperial Service Infantry Brigade |
| Dates: | August 1914 – November 1914 |
| Allegiance: | British Crown |
| Type: | Infantry |
| Size: | Brigade |
| Command Structure: | Indian Expeditionary Force B |
| Battles: | First World War |
The Imperial Service Infantry Brigade was an infantry brigade of the British Indian Army that saw active service in the East African Campaign in the First World War.
The Imperial Service Infantry Brigade was formed in August 1914, mostly from Imperial Service Troops (forces raised by the princely states of the British Indian Empire), hence its name. It was assigned to Indian Expeditionary Force B along with 27th (Bangalore) Brigade. The Force sailed from Bombay (Mumbai) on 16 October with Tanga in German East Africa as the target for an attack. After the failure of the Battle of Tanga (2–5 November), the Force disembarked at Mombasa and joined the defences of British East Africa. The brigade was broken up at this point.
The brigade had the following composition in the First World War:
The brigade was commanded from formation by Brigadier-General Michael Tighe. He later commanded the 2nd East African Division.