| Van Onselen | Wessel Hendrik | | Burger | Commando: Reitz. Click here to access the record in the Forum | Boer Forces |
| Van Onselin | L C | 892 | Private | Source: Supplementary medal roll in WO100/277 | Uitenhage Volunteer Rifles |
| Van Onslen | J | | Trooper | Source: Nominal roll in WO127 | Gorringe's Flying Column |
| Van Onslen | L C | | Private | Died of disease. Naauwpoort, 31 March 1901
Source: South African Field Force Casualty Roll | Uitenhage Volunteer Rifles |
| Van Onslen | L C | 892 | Private | Source: QSA medal roll in WO100/277 | Uitenhage Volunteer Rifles |
| Van Onslin | Wessel Hendrik | | | Prisoner number: 22133
Captured: Reitz 07 Jun 1901
Sent to: Unknown
Age: 22
Address: Wulfrust
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Van Oodtshoorn | Jacobus Johannes Van Reden | | | Prisoner number: 14681
Captured: Ermelo 18 Oct 1900
Sent to: Unknown
Age: 22
Address: Uitkyk
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Van Oodtshoorn | Martinus Godfrey Van Reden | | | Prisoner number: 14680
Captured: Ermelo 18 Oct 1900
Sent to: Unknown
Age: 32
Address: Uitkyk
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Van Oogstraten | W T | | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Van Oordt | Antonie Nics Ernest Changuion | | | Prisoner number: 27311
Captured: Johannesburg 20 Nov 1901
Sent to: St. Helena
Age: 41
Address: Johannesburg
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Van Oordt | Herman Frederick | | | Prisoner number: 28266
Captured: Emigratie 06 Jan 1902
Sent to: St. Helena
Age: 39
Address: Lebombo
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Van Oosdt | J J | 81 | Staff Sergeant | Source: QSA and KSA medal rolls | Prince Albert DMT |
| Van Oosten | Cornelis Jacobus | | | Prisoner number: 3173
Captured: Kaalfontein 01 Jul 1900
Sent to: Ceylon, Diyatalawa
Age: 29
Address: Von Schmit
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Van Oosten | Cornelis Jacobus | | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Van Oostrum | Omius | | | Prisoner number: 1704
Captured: Paardeberg 27 Feb 1900
Sent to: Ceylon, Diyatalawa
Age: 37
Address: Kafferskraal
Source: Anglo Boer War Museum 2016 | Boer Forces |
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