| Spinnler | Ambrose | | Volunteer from Switzerland serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Swiss volunteers |
| Spoonheimer | Heinrich | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Spoor | W | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Spruit | Huibert | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Stael Von Holstein | Otto | | Died Magersfontein, 11/12/1899
Volunteer from Sweden serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Scandinavian volunteers |
| Stael Von Holstein | Otto Wilhelm | | KIA Magersfontein, 11/12/1899
Volunteer from Sweden serving with the Boer forces
Source: Hjaltarna vid Magersfontein, Kapten H E Uddgren, Sweden, 1924 | Scandinavian volunteers |
| Stahlbock | Wilhelm | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Stahlke | Emil | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Stålberg | Erik | Lieutenant | WIA & POW 11/12/1899
Volunteer from Sweden serving with the Boer forces
Source: Hjaltarna vid Magersfontein, Kapten H E Uddgren, Sweden, 1924 | Scandinavian volunteers |
| Stalberg | Erik | | Died Magersfontein
Volunteer from Sweden serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Scandinavian volunteers |
| Stam | F A H | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Stang | H | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Stanislau | Hermann Gustav | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Stanlen | Herman Gustav | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Stappenblik | Wilhelm | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Starfield | ? | | Volunteer from America serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | American volunteers |
| Steen | Gerrit | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Steen | L L | | Volunteer from Holland / Belgium serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Belgian and Dutch volunteers |
| Steenberg | Anders Wilhelm | | Volunteer from Sweden serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Scandinavian volunteers |
| Steenberg | Schack | | Volunteer from Sweden serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | Scandinavian volunteers |
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