ClubLocationLeagueTierFounded
SAND—Dissolved UNK—1920
SC Hainfeld—2. Landesliga West - Niederösterreich—1920SC Katzelsdorf—2. Landesliga Ost - Niederösterreich—1920
SDZ—Eerste Klasse—1920SJC—Vierde Divisie—1920
SK Hranice—Divize E—1920
STK Eilvese—Landesliga Hannover—1920SV Bockum-Hövel—Dissolved 1971—1920SV Franckviertel Linz——1920
Sacilese—Promozione FVG—1920
Salgótarjáni BTC—MB I - Nógrád—1920San Lazzaro—Terza Categoria Emilia-Romagna—1920Sanvitese—Eccellenza FVG—1920Sassuolo—Serie A—1920
Schoten—P4 Antwerpen—1920
Sfax Railways Sports—Tunisian Ligue Professionnelle 2—1920
Shawsheen Indians—Dissolved 1926—1920Sint-Niklase—Dissolved 2000—1920
Skalica—Fortuna Liga—1920Sloga Požega—Srpska Liga Zapad—1920Slovan Břeclav—Dissolved 2005—1920Sokol Velké Přílepy—II. Třída Okresu Praha-Západ—1920
Sol de Mayo—Torneo Federal A—1920Spartaan'20—Eerste Klasse—1920Spartak Myjava—II. Liga—1920Spielberg—Verbandsliga Baden—1920
Sporting Coimbrões—Campeonato de Portugal - Série B—1920Spratzern—Landesliga Niederösterreich—1920
Stade Pontivyen—Régional 1 - Bretagne—1920
Stokesley SC—North Riding League - Premier Division—1920