| Simon | Louis William | Trooper | Unit: A. troop. Nationality: English. Age: 20, Address: Widmore Lodge, Bromley, Kent. Source: List of Jameson raiders
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| Sinclair | Angus Lawrence | Corporal | Unit: Artillery. Nationality: Scottish. Age: 30, Address: 17 Ardconnell Terrace, Inverness. Source: List of Jameson raiders
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| Slee | Charles Wilbourne | Trooper | Unit: C. troop. Nationality: English. Age: 27, Address: Bulawayo, Matabeleland. Source: List of Jameson raiders
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| Slocock | Charles Edward | Trooper | Unit: D. troop. Nationality: English. Age: 27, Address: Bulawayo, Matabeleland. Source: List of Jameson raiders
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| Smith | Alexander William | Corporal | Unit: B. troop. Nationality: English. Age: 28, Address: Corton Denhan, Sherborne, Dorset. Source: List of Jameson raiders
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| Smith | Henry Walter | Sergeant | Unit: K. troop. Nationality: English. Age: 34, Address: Mafeking, Bechuanaland. Source: List of Jameson raiders
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| Smith | James Joseph | Trooper | Unit: D. troop. Nationality: Wales. Age: 27, Address: 31 Odell St, Cardiff. Source: List of Jameson raiders
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| Smith | John | Trooper | Unit: K. troop. Nationality: Scottish. Age: 30, Address: 3 Hermitage Place, Leith, Scotland. Source: List of Jameson raiders
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| Solomon | Percy | Trooper | Unit: A. troop. Nationality: South African - Cape Colony. Address: Erickville, Sea Point, Cape Town. Source: List of Jameson raiders
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| Spain | Walter Smithey | Sub/Insp | Unit: Artillery. Nationality: English. Age: 23, Address: 10 Victoria Sq, Newcastle on Tyne. Source: List of Jameson raiders
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| Spalding | Frederick William | Trooper | Unit: G. troop. Nationality: English. Age: 25, Address: Mafeking, Bechuanaland. Source: List of Jameson raiders
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| Spring | Francis Raymond | Corporal | Unit: D. troop. Nationality: Irish. Age: 27, Address: Bulawayo, Matabeleland. Source: List of Jameson raiders
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| Springfield | Geoffrey Mandeville Osborne | SM | Unit: D. troop. Nationality: English. Age: 25, Address: Bakousthoepe Manor, Holt, Norfolk. Source: List of Jameson raiders
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| Spurrier | D/'Arce Clemence Basil | Trooper | Unit: C. troop. Nationality: Jersey. Age: 25, Address: Jersey, Channel Islands. Source: List of Jameson raiders
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| Stannard | Frederick | Trooper | Unit: C. troop. Nationality: English. Address: 134 Kennington Park, Park Rd, London. Source: List of Jameson raiders
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| Stapleton | Lewis Henry | Sergeant | Unit: C. troop. Nationality: English. Age: 21, Address: 31 Campden Grove, London, W. Source: List of Jameson raiders
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| Steadmond | Edward | Trooper | Unit: D. troop. Nationality: Irish. Age: 25, Address: 34 Bury St.Cape Town. Source: List of Jameson raiders
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| Steel | Hugh | Trooper | Unit: Artillery. Nationality: South African - Matabeleland. Address: Bulawayo, Matabeleland. Source: List of Jameson raiders
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| Steele | Alexander | Trooper | Unit: G. troop. Nationality: Canadian. Age: 30, Address: Mafeking, Bechuanaland. Source: List of Jameson raiders
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| Steer | Harry | Trooper | Unit: A. troop. Nationality: English. Age: 23, Address: 4 Corporation St, Sheffield. Source: List of Jameson raiders
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