S|
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| SAB | Services Ancillary to Broadcasting |
| SAP | Services Ancillary to Programme making |
| SAP | Satellite Action Plan |
| SAP-REG | Satellite Action Plan Regulatory Group |
| SAR | Search and Rescue |
| SAR | Synthetic Aperture Radar |
| SARP | ICAO Standards and Recommended Practices |
| SARSAT | Satellite-Aided Search and Rescue Project |
| SAT | Satellite |
| SATCOM | Satellite Communications (USA) |
| SBS | Strict Band Segmentation |
| SC | Special Committee on Regulatory/Procedural Matters (ITU) |
| SCAR | Scientific Committee on Antarctic Research |
| SCOPE | Scientific Committee on Problems of the Environment |
| SCOSTEP | Scientific Committee on Solar Terrestrial Physics |
| SCPT | Single channel per transponder |
| SCT | Scientific Committee on Telecommunications (URSI) |
| S-DAB | Satellite Digital Audio Broadcasting |
| SDARS | Satellite Direct Audio Radio Service |
| SDMA | Space Division Mulitple Access |
| SDR | Software Digital Radio |
| SE | (Working Group) Spectrum Engineering (ECC) |
| SERC | Science and Engineering Council (GB) |
| SES | Satellite Earth Stations and Systems |
| SES | Ship Earth Station |
| SESC | Space Environment Service Center |
| SETI | Search for Extra Terrestrial Intelligence |
| SFCG | Space Frequency Coordination Group |
| SFS | Standard Frequency and Time Signal Service |
| SFTSS | Standard Frequency and Time Signal-Satellite Service |
| SGLS | Space-Groundlink Subsystem |
| SHF | Super High Frequency (3 to 30 GHz) |
| SITE | Satellite Instructional Television Experiment |
| SKA | Square Kilimeter Array |
| SMR | Sub-Millimeter Radiometer |
| SMS | Short Message Service |
| SNG | Satellite News Gathering |
| SO | Space Operation Service |
| SOLAS | Safety of Life at Sea |
| SOS | Space Operation Service |
| SPAC | Spectrum Planning and Advisory Committee (USA) |
| S-PCS | Satellite Personal Communication Services |
| SPFD | Spectral Power Flux Density (dB[Watts.m-2.Hz-1]) |
| SPIE | International Society for Optical Engineering |
| SPS | Spectrum Planning Subcommittee (USA) |
| SR | Space Research |
| SRBR | Short Range Business Radio |
| SRD | Short Range Device |
| SRD/MG | Short Range Device Maintenance Group (CEPT) |
| SRR | Short Range Radar |
| SRS | Space Research Service |
| SSB | Space Science Board (of the US NAS) |
| SSC | Swedish Space Corporation |
| SSR | Secondary Surveillance Radar |
| SSR | Surface Search Radar |
| SWAS | Submillimeter Wave Astronomy Satellite (NASA) |
