| Onley | H | | | 2nd Battalion
Source: QSA and KSA medal rolls | Northumberland Fusiliers |
| Onley | H | | Able Seaman | QSA (0). Ref: 166.318. Medal returned
Source: QSA medal rolls | HMS Rattler |
| Onley | R | | | 4th Battalion
Source: QSA and KSA medal rolls | East Surrey Regiment |
| Onora | G | | Trooper | Frontier Wars. SAGS (1) 1877-8. Medal returned | Diamond Fields Horse |
| Onraet | H B | | Lieutenant | Demise: Killed in action 27 Feb 1900
Place: Tugela Heights. Pieter's Hill
Source: In Memoriam by S Watt | Royal Army Medical Corps |
| Onraët | Hugh Bernard | | Lieutenant | He was killed February 27th, 1900, in the attack on Pieter's Hill. He was born in October 1871, and entered the Royal Army Medical Corps, July 1899. He was mentioned in despatches, LG, February 8th, 1901.
Source: Donner | Royal Army Medical Corps |
| Onralt | H B | | Lieutenant | Killed at Tugela Height. 27 Feb 1900.
Source: Natal Field Force Casualty Roll, page 209 line 13 | Royal Army Medical Corps |
| Onreat | H B | | Lieutenant | MO attached Regiments & Corps. MID LG: 8 February 1901, page: 948. Source: General Buller. 30 March 1900. Re: Ladysmith
This page contains all the London Gazette pages for the Boer War | Royal Army Medical Corps |
| Onsill | P | 1949 | Private | 2nd Btn. Wounded at Near Ladysmith. 22 Feb 1900.
Source: Natal Field Force Casualty Roll, page 45 line 59 | (King's Own) Royal Lancaster Regiment |
| Onsley | W | 2735 | Lance Corporal | Killed in action. Hartebeestfontein, 18 February 1901
1st Battalion.
Source: South African Field Force Casualty Roll | Loyal North Lancashire Regiment |
| Onsley | W | 2735 | Lance Corporal | 1st Battalion
Demise: Killed in action 18 Feb 1901
Place: Hartbeesfontein
Source: In Memoriam by S Watt | Loyal North Lancashire Regiment |
| Onsley | W | 2735 | Lance Corporal | 1st Battalion
Source: QSA roll | Loyal North Lancashire Regiment |
| Onslow | A J M | | Lieutenant | Wounded. Winburg, 21 June 1900
MI
Source: South African Field Force Casualty Roll | New South Wales contingent |
| Onslow | Arthur John Macarthur | | Lieutenant | Source: OZ-Boer database | New South Wales, A squadron NSW Mounted Rifles |
| Onslow | E | | | 4th Battalion
Source: QSA and KSA medal rolls | King's Royal Rifle Corps |
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