| Santa Barbara 106.9- San Juan | — |
| Santa Clara Fm 97.9 La100 | — |
| Sector S | — |
| Sentido Comun - Frecuencia Zero | — |
| Seudonimos (Fm Flores 90.7) | — |
| Sin Salida | — |
| Sintesis Capitalina | — |
| Somos Gualeguaychu | — |
| Somos La Plata | — |
| Somos Norte Canal 7 | — |
| Somosfm.com.ar | — |
| Spacio Fm 101.5 | — |
| Splendid Am 990 | — |
| Splendid Fm | — |
| Sudestada FM La Boca | — |
| Sueltos en la City | — |
| Sueños Posibles | — |
| Sumemos | — |