| Sella | Silvio Da Chiavazza (Biella) | | Volunteer from Italy serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Other volunteers |
| Selle-Mulder | H | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Selva | Giovanni Da Mottagiata (Biella | | Volunteer from Italy serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Other volunteers |
| Semionov | Vladimir Nikolaievich | | Volunteer from Russia serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Russian volunteers |
| Semmelink | Hendrik | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Semmler | Fritz Wilhelm H | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Senevet | J | | Volunteer from France serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | French volunteers |
| Serre | L | | Volunteer from France serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | French volunteers |
| Servatins | C | | Volunteer from France serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | French volunteers |
| Seupp | Z | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Shanker | Michael | | Volunteer from Russia (Jewish) serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Russian volunteers |
| Shea | John | | Volunteer from America serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | American volunteers |
| Shelley | M | | Chicago Corps
Volunteer from America (Irish) serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | American volunteers |
| Sheppard | Reginald | | Volunteer from America (Irish) serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | American volunteers |
| Shill | ? | Doctor | Volunteer from Russia serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Russian volunteers |
| Sidorski | Adolf | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Siebken | Hugo | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Siegfried | Carl | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Sienkewicz | A | | Volunteer from France serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | French volunteers |
| Siesanberg | Leonard C | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
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