| O'Sonnor | J M | | | Source: WO100/284 | Port Elizabeth TG |
| O'Sullevan | J | | Lieutenant | Prisoner. Bethesda, 10 August 1901
Released
Source: South African Field Force Casualty Roll | French's Scouts |
| O'Sullivan | A | | | 1st Battalion
Source: Medal rolls | Royal Munster Fusiliers |
| O'Sullivan | A | 1854 | Private | Frontier Wars. SAGS (1) 1879 | Royal Warwickshire Regiment |
| O'Sullivan | A M | | | Volunteer Service Battalion
Source: QSA and KSA medal rolls | Oxfordshire Light Infantry |
| O'Sullivan | Arthur | 26031 | Private | Served 22 Jan 01 to 27 Feb 01.
Source: Nominal roll in WO127 | Cape Colony Cyclist Corps |
| O'Sullivan | B | | | Source: QSA and KSA medal rolls | 77th Battery, RFA |
| O'Sullivan | C | | Trooper |
Source: Nominal roll in WO127 | Border Horse |
| O'Sullivan | C | | | 4th Battalion
Source: Medal rolls | Royal Munster Fusiliers |
| O'Sullivan | C P | 3224 | Sapper | To Army Reserve. KSA sent 30 May 1903.
QSA (3) CC OFS Tr. KSA
TNA ref 159/31:315/42 | Royal Engineers, Telegraph Battalion, 1st Division |
| O'Sullivan | Cornelius | | | Source: Attestation paper in WO126 | Bethune's Mounted Infantry |
| O'Sullivan | D | 1809 | Sapper | Severely wounded. Platrand, 30 March 1901
Source: South African Field Force Casualty Roll | Royal Engineers, Field Company, 17th |
| O'Sullivan | D | | | Source: QSA and KSA rolls | Cape Garrison Artillery |
| O'Sullivan | D | 2300 | Sapper | To G Company 1 May 1900. KSA from 46th Company roll.
QSA (2) Belm MR. KSA
TNA ref 156/63:314/122 | Royal Engineers, Field Company, 11th |
| O'Sullivan | D | 809 | Sapper | To G Company 9 Jun 1901. Severely wounded at Platrand 30 Mar 1901.
QSA (6) CC TH RoL Tr LN SA01
TNA ref 156/113; 156/127 | Royal Engineers, Field Company, 17th |
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