Karl Siskonen Date of birth: 2 June, 1901Unit: Trained in the Battalion of Instruction for the XI Brigade, Scandinavian Battalion, Company 2; Transferred to the XV Brigade, Mackenzie-Papineau Battalion, Machine Gun Company
Arthur Johannes Siven Alternate name(s): Siveeni; Sivuni; SeevinArthi; Art; JohnDate of Birth: 23 or 26 Jun 1908Unit: Spent four weeks in jail in France before reaching Spain; 86 Brigade; XV Brigade; 35 Division; Transport; Ambulance driver
Dmytro Skawulak Alternate name(s): Shawaluk; Skavuliak; SkawalakMikeDate of birth: 25 September, 1913Unit: Mackenzie Papineau Battalion; Transport
Baden Skinner Alternate name(s): Taffy; TerryDate of birth: 20 May, 1900Unit: Mackenzie Papineau Battalion; Lincoln Battalion
William C. George Skinner Date of Birth: 27 or 29 Apr 1905Unit: Mackenzie Papineau Battalion, Company 2; Commander of Ukrainian section
Yuray Skriniar Alternate name(s): Shriner; SchrinerAl; George; Juraj; YurajDate of birth: 10 May, 1901
Paul Skup Alternate name(s): ScottSaulDate of birth: 6 June, 1916Unit: 15 Brigade; Mackenzie Papineau Battalion; 24 Battalion: Spanish Battalion
Walter Slobodzian Alternate name(s): Walter WoodmanDate of birth: 27 March, 1905Unit: Mackenzie Papineau Battalion
Jozef Smalec Alternate name(s): SmalacJoseph; JoeDate of Birth: circa 1900Unit: Bartosz Glawacki Battery; Private
Dorofie Smiechowicz Alternate name(s): Dorofiek; DerefiejSmehovitch; Smichovica; SmichowidiMick; NickDate of Birth: 1908
Lloyd Stewart Smith Alternate name(s): Jack HillRobert Stuart SimsDate of birth: 24 April, 1913Unit: Mackenzie Papineau Battalion; Trained with Company 3; Served with Company 1
Vasyl Smutylo Alternate name(s): Wasyl; Vusil; WilliamDate of birth: 24 April, 1893Unit: 15 Brigade; Dimitrov Battalion; Artillery, Company 1; American Anti-tank Anti-aircraft Battery; Balkan Battery; 35 Anglo-American Battery
Daniel Smythe Alternate name(s): SmythDanny; DavidDate of birth: 10 May, 1911Unit: Abraham Lincoln Battalion
Jozsef Soltesz Alternate name(s): Sotese; Saltesz; Saltisz; SiteseJosephDate of Birth: circa 1900Unit: Auto Park; Regiment de Tren
Henning Sorenson Date of birth: 14 May, 1901Unit: Blood Transfusion Institute; Originally went to write for New Commonwealth
James Southgate Date of Birth: circa 1906Unit: Mackenzie Papineau Battalion; Medical Unit; Ambulance driver; Garibaldi Battalion