| Henry O'Donnell | |
| Birth Date: | 10 September 1852 |
| Death Date: | 31 October 1928 (aged 76) |
| Branch: | British Army |
| Rank: | Brigadier-General |
| Unit: | West Yorkshire Regiment |
| Commands: | 35th Division |
| Battles: | First World War |
| Awards: | Companion of the Order of St Michael and St George |
Brigadier-General Henry O'Donnell (10 September 1852 – 31 October 1928) was a British Army officer who commanded the 35th Division on an acting basis during the First World War.
O'Donnell was commissioned into the West Yorkshire Regiment on 10 May 1882.
He saw action during the First World War, became an authority on military training and wrote significant papers entitled "Catechism on Field Training"[1] and "Lectures to Recruits: The training of the soldier, a lecture to recruits, and Intercommunication and passing orders and messages".[2] He became commander of 106th Brigade on 13 May 1916[3] and briefly commanded the 35th Division on an acting basis from 17 September 1916 to 23 September 1916. He was appointed a Companion of the Order of St Michael and St George in the 1919 Birthday Honours.