| Sievers | Heinrich | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Siggelhou | Hugh | | Volunteer from America serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | American volunteers |
| Siglé | Chris | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Siglé | Hendrik Theodorus | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Silvia | Antonio | | Volunteer from Italy serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Other volunteers |
| Silvo Porto | A | | Volunteer from Portugal serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Other volunteers |
| Simon | F | | Volunteer from France serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | French volunteers |
| Simon | W | Lieutenant | Volunteer from Hungary serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Austrian and Hungarian volunteers |
| Simon | Wilhelm | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Simon | Wolfgang | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Simsich | ? | | Volunteer from Austria / Hungary serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Austrian and Hungarian volunteers |
| Sinnhuber | Herman | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Sivelli | Pilade Da Genova | | Volunteer from Italy serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Other volunteers |
| Sivink | J A | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Sjawetski | Adam | | Volunteer from Russia (Jewish) serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Russian volunteers |
| Slabbert | H K E | | Scandinavian Ambulance, Assistant Red Cross Nurse
Volunteer from Scandinavia serving with the Boer forces
Source: Hjaltarna vid Magersfontein, Kapten H E Uddgren, Sweden, 1924 | Scandinavian volunteers |
| Slater | Edward Thornhill | | Volunteer from America (Irish) serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | American volunteers |
| Slatterly | James | | Chicago Corps
Volunteer from America (Irish) serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | American volunteers |
| Slattery | J | | Volunteer from America serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | American volunteers |
| Slebos | Jacobus Christiann | | Died Mafeking 16/05/1900
Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
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