| Barrett | William | | Trooper | Source: Nominal roll in WO127 | Kimberley Horse |
| Barrett | William | 831 and 3422 | Trooper | 2nd Battalion
Source: Nominal roll in WO127 | Imperial Light Horse |
| Barrett | William | | | Served to unknown data.
Source: Nominal roll in WO127 | Bechuanaland Rifles |
| Barrett | William | | | 2nd Battalion
Source: QSA and KSA rolls | Imperial Light Horse |
| Barrett | William | 755 | | Attested: Sep 1902. Source: CMP2 | Cape Police |
| Barrett | William | 22405 | Trooper | Killed Jan 3, 1901
Source: Nominal roll in WO127 | Commander-in-Chief's Bodyguard |
| Barrett | William Alexander | 11404 | Private | Source: QSA Medal Rolls | 62nd Company, 11th Btn, IY |
| Barrett | William Charles | 1017 | Trooper | Source: Nominal roll in WO127 | Kimberley Horse |
| Barrett | William Charles | 1017 | Trooper | QSA (2)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Light Horse |
| Barrett | William D | 36 | | Source: Medal rolls | Canada, 10th Canadian Field Hospital |
| Barrett | William Herbert | | | Was born Dec 10, 1860, at Crumlin. He was educated at Abergavenny Grammar School, and joined the staff of the London and NW Railway in 1875, but in 1879 he transferred to the Cape Government Railways and in Sep, 1900, to the Imperial Military, Railways. He is now traffic manager of the Central South African Railways at Bloemfontein and a JP for the ORC Mr Barrett served with the Duke of Edinburgh's Own Volunteer Rifles in the Basuto War in 1880-81 (medal), and also won the medal with clasps for Cape Colony, ORC, and the Transvaal in the Boer War, 1899-1902. | DEOVR |
| Barrett | William Michael | 447 | Trooper | Source: OZ-Boer database | New South Wales, 5th Battalion Australian Commonwe |
| Barrett | William S. | | | Source: Attestation paper in WO126 | Brabant's Horse |
| Barrett | Wm | | | 2nd Battalion
Source: QSA and KSA rolls | Imperial Light Horse |
| Barrett-Hamlton | G E H | | | 5th Battalion
Source: QSA and KSA medal rolls | Royal Irish Rifles |
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