| Callaghan | P D | | | Source: QSA and KSA medal rolls | South African Constabulary |
| Callaghan | P D | | | Source: QSA and KSA rolls | Provisional Mounted Police |
| Callaghan | R | 2526 | Private | Frontier Wars. SAGS (0) | Royal Scots Fusiliers |
| Callaghan | R | | | Source: QSA and KSA medal rolls | No 4 Mountain Battery, RGA |
| Callaghan | R | | | Source: WO100/146 | No 4 Mountain Battery, RGA |
| Callaghan | Robert | | | 4th Battalion
Source: QSA and KSA medal rolls | (King's) Liverpool Regiment |
| Callaghan | S | | | 2nd Battalion
Source: Medal rolls | Royal Munster Fusiliers |
| Callaghan | S A | | Lieutenant | MID LG: 17 January 1902, page: 375. Source: General Kitchener. 8 November 1901. Re: General mentions
This page contains all the London Gazette pages for the Boer War | Nesbitt's Horse |
| Callaghan | S C | | | 2nd Battalion
Source: QSA and KSA medal rolls | (Duke of Edinburgh's) Wiltshire Regiment |
| Callaghan | S W | | Lieutenant & QM | QSA (3). With Remount Depot, Worcester C.C..
Source: QSA medal rolls | 16th (The Queen's) Lancers |
| Callaghan | Sidney A | | Lieutenant | Joined 08 Feb 01
Source: Nominal roll in WO127 | Nesbitt's Horse |
| Callaghan | T | 65B/2049 | Private | Frontier Wars. SAGS (1) 1879 | Connaught Rangers |
| Callaghan | T | | | 2nd Battalion
Source: QSA and KSA medal rolls | (Prince of Wales's Own) West Yorkshire Regiment |
| Callaghan | T | 5260 | Private | 1st Battalion
Demise: Died of disease - enteric fever 18-12-1899
Place: Ladysmith
Source: In Memoriam by S Watt | Leicestershire Regiment |
| Callaghan | T | 16042 | Trooper , 79th IY | 1st Battalion
Source: Nominal roll in WO127 | Imperial Light Horse |
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