This page is a list of British divisions that existed in World War I. Divisions were either infantry or cavalry. Divisions were categorised as being 'Regular Army' (professional), 'Territorial Force' (part-time) or 'New Army' (wartime). The 'Territorial' cavalry was referred to as Yeomanry.
| Guards Division |
| 1st Division |
| 2nd Division |
| 3rd Division |
| 4th Division |
| 5th Division |
| 6th Division |
| 7th Division |
| 8th Division |
| 9th (Scottish) Division |
| 10th (Irish) Division |
| 11th (Northern) Division |
| 12th (Eastern) Division |
| 13th (Western) Division |
| 14th (Light) Division |
| 15th (Scottish) Division |
| 16th (Irish) Division |
| 17th (Northern) Division |
| 18th (Eastern) Division |
| 19th (Western) Division |
| 20th (Light) Division |
| 21st Division |
| 22nd Division |
| 23rd Division |
| 24th Division |
| 25th Division |
| 26th Division |
| 27th Division |
| 28th Division |
| 29th Division |
| 30th Division |
| 31st Division |
| 32nd Division |
| 33rd Division |
| 34th Division |
| 35th Division |
| 36th (Ulster) Division |
| 37th Division |
| 38th (Welsh) Division |
| 39th Division |
| 40th Division |
| 41st Division |
| 42nd (East Lancashire) Division |
| 43rd (Wessex) Division |
| 44th (Home Counties) Division |
| 45th (2nd Wessex) Division |
| 46th (North Midland) Division |
| 47th (1/2nd London) Division |
| 48th (South Midland) Division |
| 49th (West Riding) Division |
| 50th (Northumbrian) Division |
| 51st (Highland) Division |
| 52nd (Lowland) Division |
| 53rd (Welsh) Division |
| 54th (East Anglian) Division |
| 55th (West Lancashire) Division |
| 56th (1/1st London) Division |
| 57th (2nd West Lancashire) Division |
| 58th (2/1st London) Division |
| 59th (2nd North Midland) Division |
| 60th (2/2nd London) Division |
| 61st (2nd South Midland) Division |
| 62nd (2nd West Riding) Division |
| 63rd (2nd Northumbrian) Division |
| 63rd (Royal Naval) Division |
| 64th (2nd Highland) Division |
| 65th (2nd Lowland) Division |
| 66th (2nd East Lancashire) Division |
| 67th (2nd Home Counties) Division |
| 68th (2nd Welsh) Division |
| 69th (2nd East Anglian) Division |
|
| 71st Division |
| 72nd Division |
| 73rd Division |
| 74th (Yeomanry) Division |
| 75th Division |