The 86th Brigade was a formation of the British Army. It was originally formed from regular army battalions serving away from home in the British Empire. It was assigned to the 29th Division and served on the Western Front and the Gallipoli Campaign and in Egypt during the First World War.
The following units served with the brigade at various time during the war:[1][2]
| Rank | Name | Date appointed | Notes |
|---|---|---|---|
| Lieutenant-Colonel | H. V. S. Ormond | 11 January 1915 | Acting |
| Brigadier-General | S. W. Hare | 1 February 1915 | Wounded 25 March 1915 |
| Colonel | O. C. Wolley-Dod | 25 April 1915 | Temporary |
| Lieutenant-Colonel | D. E. Cayley | 27 April 1915 | Acting |
| Lieutenant-Colonel | H. G. Casson | 30 April 1915 | Acting |
| Brigade split up 4 May 1915, reformed 6 June 1915 | |||
| Brigadier-General | O. C. Wolley-Dod | 6 June 1915 | Invalided 13 August 1915 |
| Brigadier-General | D. E. Cayley | 13 August 1915 | Temporary |
| Brigadier-General | C. J. Perceval | 14 August 1915 | |
| Brigadier-General | W. de L. Williams | 20 December 1915 | |
| Brigadier-General | R. G. Jelf | 29 April 1917 | Invalided 16 August 1917 |
| Lieutenant-Colonel | H. Nelson | 16 August 1917 | Acting |
| Brigadier-General | G. R. H. Cheape | 24 August 1917 | |