ClubLocationLeagueTierFounded
Radnički Beograd—Srpska Liga Beograd—1920
Rhede—Bezirksliga Niederrhein—1920Rheingold Lichtenau—Kreisliga A Baden-Baden Süd—1920
Rosario Puerto Belgrano—Liga del Sur—1920Rot-Weiß Hasborn-Dautweiler—Saarlandliga—1920
Rot-Weiß Rankweil—Landesliga Vorarlberg—1920Rot-Weiß Weiler—Verbandsliga Württemberg—1920
Rovigo—Prima Categoria Veneto—1920
Ruch Chorzów—I Liga—1920
Rudar—2. CFL—1920SAND—Dissolved in UNK—1920SC Hainfeld—2. Landesliga West - Niederösterreich—1920SC Katzelsdorf—2. Landesliga Ost - Niederösterreich—1920
SDZ—Eerste Klasse—1920SJC—Vierde Divisie—1920
SK Hranice—Divize E—1920STK Eilvese—Landesliga Hannover—1920SV Bockum-Hövel—Dissolved in 1971—1920SV Franckviertel Linz——1920SV Steinbach—Verbandsliga Hessen-Nord—1920Sacilese—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 in 1926—1920Sint-Niklase—Dissolved in 2000—1920
Skalica—Fortuna Liga—1920