| O'Callaghan | D | | | 2nd Battalion
Source: Medal rolls | Royal Munster Fusiliers |
| O'Callaghan | D | | Trooper | Natal 1906 (1)
Source: Recipients of the Natal 1906 Medal | Royston's Horse |
| O'Callaghan | D | 4699 | Private | QSA (3)
Source: List of QSAs with the clasp Talana from the Talana book | Royal Dublin Fusiliers |
| O'Callaghan | D | | | 2nd Battalion
Source: QSA and KSA medal rolls | Royal Dublin Fusiliers |
| O'Callaghan | Daniel | 286 | Trooper | BSACM Mashonaland 1897 (0).
Source: BSACM rolls | British South Africa Police |
| O'Callaghan | E | | | Received the Mediterranean Medal
3rd Battalion
Source: Medal roll WO100 368 | (Prince of Wales's Own) West Yorkshire Regiment |
| O'Callaghan | Edward Daniel | 558 | Trooper | Served in 1st KFS. Joined Umtali 22 Dec 00 Discharged 1 Jun 01 medically unfit Pretoria
Source: Nominal roll in WO127 | Kitchener's Fighting Scouts |
| O'Callaghan | F | | | 2nd Battalion
Source: QSA and KSA medal rolls | (Prince of Wales's Own) West Yorkshire Regiment |
| O'Callaghan | G A | | Lieutenant | Source: Nominal roll in WO127 | Rimington's Guides |
| O'Callaghan | G A | | | 1st Battalion
Source: QSA and KSA medal rolls | Royal Irish Regiment |
| O'Callaghan | G H K | | Civil Surgeon | Frontier Wars. SAGS (1) 1879 | Army Medical Service |
| O'Callaghan | Henry | 6437 | Gunner | QSA (4) DoL OFS LN Belf
Provisional list of recipients
Source: Ladysmith Siege Account and Medal Roll | No 10 Mountain Battery, RGA |
| O'Callaghan | J | 3973 | Private | QSA (6). Severe Wound, Bethesda, 12 Feb 01. Home 18 May 01.
Source: QSA medal rolls | 14th (The King's) Hussars |
| O'Callaghan | J | 11278 | Corporal | Demise: Died of disease 29 Apr 1901
Place: Kroonstad
Source: In Memoriam by S Watt | Army Service Corps |
| O'Callaghan | J | | | 1st Battalion
Source: Medal rolls | Royal Munster Fusiliers |
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