| Clark | John J | | | Volunteer Service Company
Source: QSA and KSA medal rolls | Royal Scots Fusiliers |
| Clark | John Matthew | 976 | Private | Source: OZ-Boer database | New South Wales, NSW Imperial Bushmen |
| Clark | John Mcmillan | | | Source: QSA and KSA medal rolls | New Zealand, 9th Contingent |
| Clark | John Taylor | | Trooper | Source: Nominal roll in WO127 | Colonial Scouts |
| Clark | John W | | | Source: WO100/281 | Jagersfontein TG |
| Clark | John Wesley | 893 | | Source: Medal rolls | Canada, 2nd Canadian Mounted Rifles |
| Clark | John William | 1351 | | Source: Attestation papers. See image on this site. | Railway Pioneer Regiment |
| Clark | John William | 1351 | Private | 2nd RPR
Source: Nominal roll in WO127 | Railway Pioneer Regiment |
| Clark | John William | 23721 | Private | Served 29 Dec 00 to 26 Feb 01.
Source: Nominal roll in WO127 | Cape Colony Cyclist Corps |
| Clark | John William | 10824 | Private | Source: QSA Medal Rolls | 57th Company, 15th Btn, IY |
| Clark | Joseph | 465 | Trooper | Source: Nominal roll in WO127 | Warren's Mounted Infantry |
| Clark | Joseph | 3249 | Trooper | Source: Nominal roll in WO127 | Thorneycroft's Mounted Infantry |
| Clark | Joseph | 753 | Corporal | Source: Nominal roll in WO127 | Durban Light Infantry |
| Clark | Joseph | 356 | | A Company
Source: Nominal roll in WO127 | DEOVR |
| Clark | Joseph E | 14491 | Private | No known Company. Served in 20th Btn IY
Source: QSA Medal Rolls | Imperial Yeomanry |
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