| Olsen | J P | | | Volunteer from Denmark serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Scandinavian volunteers |
| Olsen | James A | 250 | Ranger | Served between 21/5/1901 and 30/11/1901. Reason for discharge: Disbanded. Attested: Pretoria.
Source: Nominal roll | Cattle Ranger's Corps |
| Olsen | Johannes | | | WIA & POW 11/12/1899
Volunteer from Norway serving with the Boer forces
Source: Hjaltarna vid Magersfontein, Kapten H E Uddgren, Sweden, 1924 | Scandinavian volunteers |
| Olsen | Johannes | | | Volunteer from Norway serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Scandinavian volunteers |
| Olsen | John | 35613 | Trooper | Source: Nominal roll in WO127 | Kimberley Horse |
| Olsen | John | | | Prisoner number: 20113
Captured: Wolvenpoort 21 Jun 1901
Sent to: Unknown
Age: 62
Address: Ventersfontein
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Olsen | John | | | Prisoner number: 1709
Captured: Magersfontein 11 Dec 1899
Sent to: St. Helena
Age: 22
Address: Pretoria
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Olsen | John | | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Olsen | M A | | Trooper | Natal 1906 (1)
Source: Recipients of the Natal 1906 Medal | Natal Mounted Rifles |
| Olsen | Martin | 21243 | Trooper | 2nd Brabant's Horse
Source: Nominal roll in WO127 | Brabant's Horse |
| Olsen | Martin | 252 | Trooper | QSA (3) OFS DoM Tr
Source: Mafeking Siege Account and Medal Roll | Protectorate Regiment |
| Olsen | Martin | | | Source: Attestation paper in WO126 | Brabant's Horse |
| Olsen | Martin Andrew | | Trooper | Source: Nominal roll | French's Scouts |
| Olsen | Martin Andrew | 206 | Trooper | Source: Nominal roll in WO127 | Thorneycroft's Mounted Infantry |
| Olsen | O | 1695 | Trooper | Demise: Died of disease - enteric fever 08 May 1901
Place: Cradock
Source: In Memoriam by S Watt | Kaffrarian Rifles |
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