Abkürzungen "S"
| SAAM | Soviet Antarctic Meteo |
| SAC | Scandinavian Activity Contest |
| SADARC | Shepparton and District Amateur Radio Club |
| SAE | Self Addressed Envelope |
| SARA | Slovak Amateur Radio Association |
| SARA | Seychelles Amateur Radio Association  |
| SARC | Summerland Amateur Radio Club |
| SARL | South African Radio League |
| SARS | Saudi Amateur Radio Society |
| SARTG | Scandinavian Amateur Radio Teleprinter Group |
| SARTS | Singapore Amateur Radio Transmitting Society |
| SASE | Self Addressed Stamped Envelope |
| SB | Single Band (Contest) |
| SCC | Slovenia Contest Club |
| SCOTIA | Scottish Island Award |
| SCWC | Serbian CW Club |
| SDR | Software-Defined Radio |
| SDRS | South Dorset Radio Society |
| SDXF | Swiss DX Foundation |
| SDXG | Süddeutsche DX Gruppe |
| SEARG | South Eastern Amateur Radio Group |
| SES | Special Event Station |
| SHRAK | Station der Kosovo Amateur Radio Association |
| SHSC | Radio Telegraphy Super High Speed Club |
| SHTSF | Société Havraise de Télégraphie Sans Fil |
| SKARC | South Kesteven Amateur Radio Society |
| SKCC | Straight Key Century Club |
| SO | Single OP |
| SOP | Sea of Peace |
| SOTA | Summits on the Air |
| SP | Short Path |
| SPPA | SP Powiat Award |
| SP RVG | Polish Radiovideography Club |
| SRAL | Suomen Radioamatöörilitto ry. |
| SRS | Amateur Radio Association of Serbia |
| SSA | Sveriges Sändareamatörer |
| SSTV | Slow Scan Television |
| SVGARC | St. Vincent & the Grenadines Amateur Radio Club |
| SWODXA |
SouthWest Ohio DX Association |
| SYLRA | Scandinavian Young Ladies Radio Amateur |
