| Costello | M | | | 1st Battalion
Source: QSA and KSA medal rolls | Royal Dublin Fusiliers |
| Costello | M | | | 4th Battalion
Source: QSA and KSA medal rolls | Royal Dublin Fusiliers |
| Costello | M | | | 2nd Battalion
Source: QSA and KSA medal rolls | Royal Warwickshire Regiment |
| Costello | M | | | 1st Battalion
Source: Medal rolls | Prince of Wales's Leinster Regiment (Royal Canadia |
| Costello | M | | | 1st Battalion
Source: QSA and KSA medal rolls | King's Royal Rifle Corps |
| Costello | M | | | 1st Battalion
Source: QSA and KSA medal rolls | King's Royal Rifle Corps |
| Costello | M | 4974 | Private | QSA (3)
Source: List of QSAs with the clasp Talana from the Talana book | Royal Dublin Fusiliers |
| Costello | M | 4429 | Lance Corporal | 6th Battalion
Source: QSA roll | Lancashire Fusiliers |
| Costello | Martin | 383 | Ranger | Served between 6/7/1901 and 15/1/1902. Reason for discharge: Disbanded. Attested: East London.
Source: Nominal roll | Cattle Ranger's Corps |
| Costello | Martin | 129 | Private | Source: OZ-Boer database | Queensland, 4th Imperial Bushmen Contingent |
| Costello | P | 2369 | Sapper | QSA (6) CC TH OFS RoL Tr LN. KSA
TNA ref 156/105; 314/3 | Royal Engineers, Field Company, 17th |
| Costello | P | | | 1st Battalion
Source: QSA and KSA medal rolls | Royal Dublin Fusiliers |
| Costello | P | | | 2nd Battalion
Source: QSA and KSA medal rolls | Royal Dublin Fusiliers |
| Costello | P | | | 1st Battalion
Source: Medal rolls | Royal Munster Fusiliers |
| Costello | P | 4106 | Private | 1st Battalion
Source: QSA roll | (Princess Victoria's) Royal Irish Fusiliers |
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