| Team | Nickname | Intl | Type | Ground |
|---|---|---|---|---|
| Men | Unknown | |||
| Men | Unknown | |||
| Men | The Asda Foundation Stadium | |||
| Sion | Men | Tolka Park | ||
| Sion Swifts | Women | Unknown | ||
| Siroki | Men | Pecara Stadium | ||
| Men | Woodstock Park | |||
| Men | Unknown | |||
| SJK | Men | Unknown | ||
| SKA-Khabarovsk | Men | Unknown | ||
| Men | Vertigo Stadium | |||
| Men | JMO Sports Park | |||
| The Snow Wolves | Men | Unknown | ||
| None | Men | Gradski Stadion | ||
| Skerries Town | Men | Unknown | ||
| Skerries Town (Saturday) | Men | Unknown | ||
| Skonto Riga | Men | Skonto Stadium | ||
| SAIK | Men | Unknown | ||
| Slovan Hutteldorfer | Men | Unknown | ||
| Haugesund | Men | Haugesund Stadion | ||
| Sky Blue FC | Men | Unknown | ||
| Men | Unknown | |||
| None | Men | Unknown | ||
| Slavia Praha | Men | Sinobo Stadium | ||
| Slavia | Women | Unknown | ||
| Benfica | Women | Tolka Park | ||
| Men | Eslaforde Park | |||
| None | Men | MacSharry Park | ||
| Bit O' Red | Men | The Showgrounds | ||
| Bit O' Red | Men | The Showgrounds | ||
| Bit O' Red | Men | The Showgrounds | ||
| Bit O'Red | Men | Unknown | ||
| Sligo Rovers | Men | Unknown | ||
| Sligo Rovers | Men | Unknown | ||
| Bit o Red | Men | The Showgrounds | ||
| Sligo Rovers U17 | Men | The Showgrounds | ||
| Bit o Red | Men | The Showgrounds | ||
| Bit O'Red | Women | The Showgrounds | ||
| Bit O'Red | Women | The Showgrounds Astro | ||
| Sligo Rovers WU19 | Women | The Showgrounds | ||
| Men | Thornhill Park | |||
| Men | Arbour Park | |||
| Slovácko | Men | Unknown | ||
| The Falcons | ✅ | Men | Tehelné Pole | |
| Men | Tolka Park | |||
| Slovakia | ✅ | Men | Unknown | |
| Slovakia | ✅ | Men | Unknown | |
| Slovakia | ✅ | Women | Unknown | |
| Slovakia Women U17 | ✅ | Women | Unknown | |
| Slovakia WU19 | ✅ | Women | Unknown |
