| Clark | H J W | | | Source: QSA and KSA medal rolls | New Zealand, 6th Contingent |
| Clark | H S | 29160 | Corporal | Source: QSA Medal Rolls | 38th Company, 10th Btn, IY |
| Clark | H S | 4225 | Sergeant | QSA (4).
Source: QSA medal rolls | 6th (Inniskilling) Dragoons |
| Clark | H W | | | Source: QSA and KSA medal rolls | National Scouts |
| Clark | Harold | | | Source: WO100/285 | Tarkastad TG |
| Clark | Harold Conquest | 20618 | Trooper | Source: QSA Medal Rolls | 1st Co, 1st Btn, IY |
| Clark | Harry Colin | 1265 | Private | Source: QSA Medal Rolls | 13th Company, 5th Btn, IY |
| Clark | Henry | 42898 | Trooper | No known Company. Served in 38th Btn IY
Source: QSA Medal Rolls | Imperial Yeomanry |
| Clark | Henry | 33104 | Trooper | Source: QSA Medal Rolls | 101st Company, 5th Btn, IY |
| Clark | Henry Atwood | 53 | Sergeant | Source: QSA Medal Rolls | 1st Co, 1st Btn, IY |
| Clark | Henry George | 5540 | Private | Source: QSA Medal Rolls | 3rd Co, 1st Btn, IY |
| Clark | Henry Thomas | 26 | | Occupation: Engine Driver. Next of kin: Father. Address: Newington London Eng .
Source: Attestation paper in WO126 | Town Guard and District Mounted Troops |
| Clark | Henry William | 33487 | Private | Source: QSA Medal Rolls | 95th Company, 24th Btn, IY |
| Clark | Herber George | 328 | Private | Source: QSA and KSA medal rolls | Dordrecht District Volunteer Guard |
| Clark | Herbert | 33446 | Private | Source: QSA Medal Rolls | 96th Company, 24th Btn, IY |
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