| Clark | Walter James | 128 | Trooper | Served in 1st KFS. Joined Pretoria 28 Jan 01 Discharged 31 Jul 01 completion of service Pretoria
Source: Nominal roll in WO127 | Kitchener's Fighting Scouts |
| Clark | WH | | Corporal | 2nd Brabant's Horse
Source: Nominal roll in WO127 | Brabant's Horse |
| Clark | William | 872 | Trooper | Source: KSA medal roll in WO100/360 | Colonial Light Horse |
| Clark | William | 13674 | Private | Base Co
Source: QSA Medal Rolls | Imperial Yeomanry |
| Clark | William | 30522 | Trooper | Source: Nominal roll in WO127 | Prince of Wales Light Horse |
| Clark | William | 1402 | Trooper | Joined 29 Jul 01 NOK: Mother: Mrs A Clark Gremore Co Louth ireland. Trooper Trans depot 31st January 1902
Source: Nominal roll in WO127 | Bethune's Mounted Infantry |
| Clark | William | | | Wounded. Attested: Apr 1896. Source: CMP7 | Cape Police |
| Clark | William | | | Attested: Oct 1895. Source: CMP7 | Cape Police |
| Clark | William | 39185 | Private | Source: QSA Medal Rolls | Imperial Yeomanry |
| Clark | William | 2268 | Sergeant | 4th RPR
Source: Nominal roll in WO127 | Railway Pioneer Regiment |
| Clark | William | 30708 | Trooper | Source: QSA Medal Rolls | 88th Company, 9th Btn, IY |
| Clark | William | 345 | Trooper | Served 23 Jan 01 to 26 Jul 01. Discharged Completion of Service M'Burg
Source: Nominal roll in WO127 | Scottish Horse |
| Clark | William | | | District 2
Source: QSA and KSA rolls | Cape Police |
| Clark | William | 190 | Private | Source: OZ-Boer database | Victoria, 6th Battalion Australian Commonwealth Ho |
| Clark | William | 961 | Private | Source: Nominal roll in WO127 | Imperial Light Infantry |
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