| Rinascita Basket Rimini | Serie A2 | Rimini | 1947 | Palasport Flaminio |
| Riva del Garda Basket | — | Riva del Garda | — | — |
| Riviera Vado Basket | — | — | — | — |
| Robur Basket Osimo | — | Osimo | — | — |
| Robur et Fides Varese | — | Varese | — | — |
| Roseto Sharks | — | Roseto degli Abruzzi | 1946 | — |
| Saetas de Oro | Copa Peru | — | — | — |
| San Antonio Spurs | National Basketball Association | — | 1967 | Alamodome, Kay Bailey Hutchison Convention Center, HemisFair Arena, Fort Worth Convention Center, Frost Bank Center, Moody Coliseum, Lubbock Municipal Coliseum |
| San Diego Football Club | Major League Soccer | San Diego | 18 de maio de 2023 | Snapdragon Stadium |
| San Diego Padres | Major League Baseball | San Diego | 1969 | PETCO Park |
| San Francisco 49ers | National Football League | — | 1946 | Levi's Stadium |
| San Francisco de Asís de Lonya Grande | Copa Peru | — | 1946 | — |
| San Francisco Giants | Major League Baseball | São Francisco | 1883 | Oracle Park |
| San Jose Sharks | — | — | 1991 | Cow Palace, SAP Center |
| San Lorenzo de Almagro de Chiclayo | Copa Peru | — | — | Estádio Elías Aguirre |
| San Martín de Porres de Pucallpa | Copa Peru | — | 9 de abril de 1964 | Estadio Aliardo Soria Pérez |
| Santa Marinella Basket | — | — | — | — |
| Santiago Barranco | Copa Peru | — | 20 de setembro de 1929 | — |
| Santos FC (Peru) | Copa Peru | — | — | Estadio José Picasso Peratta |
| Scafati Basket | Liga Italiana de Basquetebol | Scafati | 1969 | PalaMangano |
| Seattle Kraken | — | — | 2021 | Climate Pledge Arena |
| Seattle Mariners | Major League Baseball | — | 1977 | Kingdome, T-Mobile Park |
| Seattle Metropolitans | Pacific Coast Hockey League | Seattle | 1915 | — |
| Seattle Seahawks | National Football League | — | 1976 | Kingdome, Husky Stadium, Lumen Field |
| Seattle Sounders Football Club | Major League Soccer | Seattle | 2009 | Lumen Field |
| Seattle SuperSonics | — | Washington | 1967 | Kingdome, Climate Pledge Arena, Tacoma Dome |
| Sebastiani Basket Club Rieti | — | — | — | — |
| Senati FBC | Copa Peru | — | — | Estádio Mariano Melgar |
| Serrato Pacasmayo | Segunda División (Campeonato Peruano de Futebol) | — | 2012 | Estadio Carlos A. Olivares |
| Sheboygan Red Skins | National Basketball Association | Sheboygan | 1938 | Playdium, Sheboygan Municipal Auditorium and Armory |
| Sisv Viterbo | — | Viterbo | — | — |
| Societa Veroli Basket | — | Frosinone | 1968 | — |
| Società Ginnastica Roma | — | — | — | — |
| Società Ginnastica Triestina | — | Trieste | 1930 | — |
| Spider Fabriano | — | — | — | — |
| Sport Boys Association | Torneo Descentralizado | — | 1927 | Estádio Miguel Grau (Callao) |
| Sport Chorrillos | Copa Peru | — | — | Estádio Campeones del 36 |
| Sport Club Alcamo | — | Alcamo | — | — |
| Sport Coopsol | Segunda División (Campeonato Peruano de Futebol) | — | 2000 | Estadio Municipal de Chorrillos |
| Sport Dos de Mayo | Copa Peru | — | — | Union Tarma Stadium |
| Sport Huamanga | Copa Peru | — | 2002 | Estádio Ciudad de Cumaná |
| Sport Inca | — | — | 18 de maio de 1908 | Estadio Nacional del Perú (1897) |
| Sport José Gálvez | — | — | 1902 | Estadio Nacional del Perú (1897) |
| Sport Juan Bielovucic | — | — | — | Estadio Nacional del Perú (1897) |
| Sport Pilsen Callao | Copa Peru | — | 1924 | — |
| Sport Sáenz Peña | — | — | 1906 | Estadio Telmo Carbajo |
| Sport Vallejo | Copa Peru | — | outubro 2002 | Estádio Mansiche |
| Sport Victoria | Copa Peru | — | 1916 | Estadio José Picasso Peratta |