- S - Sounding rocket - Japan
- S - Intermediate range cruise missile - Russia - See Tu-121
- S-1 - Spacecraft - Earth - Magnetosphere - USA
- S-100 - Spacecraft - Manned - Space Suits - USA
- S-1029 - Spacecraft - Manned - Space Suits - USA
- S-15 - Spacecraft - Solar - - USA
- S-155 - Rocket Engine - Russia -
- S-2 - Spacecraft - Earth - Magnetosphere - USA
- S-20 - Rocket Engine - Brazil - Solid propellant
- S-200 - Surface-to-air missile - Russia
- S-210 - Rocket Engine - Japan - Solid propellant
- S-225 - Anti-ballistic missile - Russia
- S-23 - Rocket Engine - Brazil - Solid propellant
- S-25 - Surface-to-air missile - Russia
- S-250 - rocket - See Kappa
- S-3 - Rocket Engine - Russia - Nitric acid/Kerosene propellant
- S-3 - Rocket Engine - USA - Lox/Kerosene propellant
- S-30 - Spacecraft - Earth - Ionosphere - USA
- S-30 - Rocket Engine - Brazil - Solid propellant
- S-300 - Rocket Engine - Russia - Solid propellant
- S-300 - Surface-to-air missile - Russia
- S-300P - - (Launch System Designation) - See S-300
- S-300PMU-1 - - (Launch System Designation) - See S-300
- S-300PMU-2 - - (Launch System Designation) - See S-300
- S-300V - Surface-to-air missile - Russia (Launch System Designation) - See Antey-2500
- S-300V - - (Launch System Designation)
- S-300V - Surface-to-air missile - Russia
- S-300V - Surface-to-air missile - Russia (Launch System Designation)
- S-31 - Rocket Engine - Brazil - Solid propellant
- S-310 - Rocket Engine - Japan - Solid propellant
- S-3D - Rocket Engine - USA - Lox/Kerosene propellant - See S-3
- S-4 - Spacecraft - Manned - Space Suits - USA
- S-40 - Rocket Engine - Brazil - Solid propellant
- S-400 - Surface-to-air missile - Russia
- S-43 - Rocket Engine - Brazil - Solid propellant
- S-44 - Rocket Engine - Brazil - Solid propellant
- S-46 - Spacecraft - Earth - Magnetosphere - USA
- S-500 - Surface-to-air missile - Russia (Launch System Designation) - See R-500
- S-500 - Surface-to-air missile - Russia
- S-520 - Rocket Engine - Japan - Solid propellant
- S-55 - Spacecraft - Earth - Micrometeoroid - USA
- S-56 - Spacecraft - Earth - Atmosphere - USA
- S-75 - Surface-to-air missile - Russia
- S-939 - Spacecraft - Manned - Space Suits - USA
- S-IVB IU - Spacecraft - Manned - Space station module -
- S09.29 - Rocket Engine - Russia - Nitric acid/Amine propellant
- S09.29.0B - Rocket Engine - Russia - Nitric acid/Amine propellant - See S09.29
- S09.502 - Rocket Engine - Russia - Nitric acid/Amine propellant
- S1.35800 - Rocket Engine - Russia - Lox/Kerosene propellant
- S1.5400 - Rocket Engine - Russia - Lox/Kerosene propellant
- S1010 - Spacecraft - Manned - Space Suits - USA
- S1024 - Spacecraft - Manned - Space Suits - USA - See A/P22S-6
- S1024B - Spacecraft - Manned - Space Suits - USA - See A/P22S-6A
- S1030 - Spacecraft - Manned - Space Suits - USA
- S1030A - Spacecraft - Manned - Space Suits - USA - See EES
- S1031 - Spacecraft - Manned - Space Suits - USA
- S1032 - Spacecraft - Manned - Space Suits - USA - See Shuttle LES
- S1034 - Spacecraft - Manned - Space Suits - USA
- S1035 - Spacecraft - Manned - Space Suits - USA - See ACES
- S1035X - Spacecraft - Manned - Space Suits - USA - See D-1
- S2.1150 - Rocket Engine - Russia - Nitric acid/Amine propellant
- S2.145 - Rocket Engine - Russia -
- S2.253 - Rocket Engine - Russia - Lox/Kerosene propellant
- S2.253 - Rocket Engine - Russia - Nitric acid/Kerosene propellant
- S2.713 - Rocket Engine - Russia - Nitric acid/Amine propellant
- S2.720 - Rocket Engine - Russia - Nitric acid/Amine propellant
- S2.721 - Rocket Engine - Russia - Nitric acid/Amine propellant
- S2.726 - Rocket Engine - Russia - Nitric acid/Amine propellant
- S3.42 - Rocket Engine - Russia -
- S5.1 - Rocket Engine - Russia - Nitric acid/Amine propellant
- S5.3 - Rocket Engine - Russia - Nitric acid/Amine propellant
- S5.4 - Rocket Engine - Russia - Nitric acid/Amine propellant
- S5.44 - Rocket Engine - Russia - Nitric acid/Amine propellant
- S5.45 - Rocket Engine - Russia - Nitric acid/UDMH propellant
- S5.51 - Rocket Engine - Russia - N2O4/UDMH propellant
- S5.80 - Rocket Engine - Russia - Lox/Kerosene propellant
- S5.92 - Rocket Engine - Russia - N2O4/UDMH propellant
- S5.98 - Rocket Engine - Russia - N2O4/UDMH propellant
- S80/T - Spacecraft - Technology - Communications - France
- S901/970 - Spacecraft - Manned - Space Suits - USA
- SA-1 - Surface-to-air missile - Russia (US Department of Defence Designation) - See S-25
- SA-10 - - (US Department of Defence Designation) - See S-300
- SA-12 - Surface-to-air missile - Russia (US Department of Defence Designation) - See S-300V
- SA-12a - - (US Department of Defence Designation) - See Antey-2500
- SA-12a - - (US Department of Defence Designation) - See S-300V
- SA-12b - - (US Department of Defence Designation) - See Antey-2500
- SA-12b - - (US Department of Defence Designation) - See S-300V
- SA-200 - Spacecraft - Surveillance - Military - USA
- SA-200HP - Spacecraft - Earth - Seasat - USA - See Coriolis
- SA-200HP - Spacecraft - Planetary - Asteroid - USA - See Deep Space 1
- SA-200LL - Spacecraft - Astronomy - Gamma Ray - USA - See Swift
- SA-200S - Spacecraft - Solar - - USA - See HESSI
- SA-21 - Surface-to-air missile - Russia (US Department of Defence Designation) - See S-500
- SA-2A,B - Surface-to-air missile - Russia (US Department of Defence Designation) - See S-75
- SA-2C,D,E,F - - (US Department of Defence Designation) - See S-75
- SA-4 - Surface-to-air missile - Russia (US Department of Defence Designation) - See Krug
- SA-5 - Surface-to-air missile - Russia (US Department of Defence Designation) - See Dal
- SA-5 - Surface-to-air missile - Russia (US Department of Defence Designation) - See S-200
- SA-5A - - (US Department of Defence Designation) - See S-200
- SA-5B - - (US Department of Defence Designation) - See S-200
- SA-5C - - (US Department of Defence Designation) - See S-200
- SA-6 - Surface-to-air missile - Russia (US Department of Defence Designation) - See Kub
- SA-II - Rocket Engine - Japan - Solid propellant
- SA-N-2 - - (US Department of Defence Designation) - See S-75
- SA-N-6 - - (US Department of Defence Designation) - See S-300
- Saber - - (ASCC Reporting Name) - See Pioner
- Sabre - Rocket Engine - UK - Air/Lox/LH2 propellant
- SAC - Space Project - Astronomy -
- SAC-A - Spacecraft - Technology - - Argentina
- SAC-B - Spacecraft - Solar - - Argentina
- SAC-C - Spacecraft - Earth - Landsat - Argentina
- Sacco - Dr Albert Sacco Jr - American Payload Specialist Astronaut -
- SACI - Spacecraft - Technology - - Brazil
- Saddler - - (ASCC Reporting Name) - See R-16
- Saddler - Intercontinental ballistic missile - Ukraine (ASCC Reporting Name) - See R-16
- Saenger - Eugen Albert Saenger - German German Engineer -
- Saenger - Intercontinental boost-glide missile - Germany
- Saenger I - Spacecraft - Manned - Spaceplane - Germany
- Saenger I - Winged orbital launch vehicle - Germany
- Saenger II - Winged orbital launch vehicle - Germany
- Safe Haven - Spacecraft - Manned - Space Station -
- Safir - Spacecraft - Communications - Store-dump - Germany
- Sagdeyev - Roald Z Sagdeyev - Russian Scientist -
- SAGE - Spacecraft - Earth - Atmosphere - USA
- SAINT - Spacecraft - Military - ASAT - USA
- SAINT II - Spacecraft - Manned - Combat - USA
- Saley - Yevgeni Vladimirovich Saley - Russian Pilot Cosmonaut - Air Force Group 6 - 1976
- Sallwey - Hans Sallwey - German Engineer -
- Salter - Robert M Salter, Jr - American Scientist -
- Salyut - Space Project - Manned - Spacecraft
- Salyut 1 - Spacecraft - Manned - Space Station - Russia
- Salyut 4 - Spacecraft - Manned - Space Station - Russia
- Salyut 6 - Spacecraft - Manned - Space Station - Russia
- Salyut 7 - Spacecraft - Manned - Space Station - Russia
- Salyut 7/TKS-2 - Manned spaceflight - Salyut 7 program (Cancelled flight)
- Salyut 7/TKS-3 - Manned spaceflight - Salyut 7 program (Cancelled flight)
- SAM-A-18 / M3 - - - See Hawk
- SAM-A-19 - Anti-ballistic missile - USA (US Department of Defence Designation) - See Plato
- SAM-A-7 / M1 - Surface-to-air missile - USA - See Nike Ajax
- SAM-N-2 - Surface-to-air missile - USA (US Department of Defence Designation) - See Lark
- SAM-N-4 - Surface-to-air missile - USA - See Lark
- SAM-N-6 - Surface-to-air missile - USA - See Talos
- SAM-N-6B1 - - - See Talos
- SAM-N-6B1-CW - - - See Talos
- SAM-N-6B1-CW - Surface-to-air drone - - See Talos
- SAM-N-6B1-CW - Tactical cruise missile - - See Talos
- SAM-N-6BW - - - See Talos
- SAM-N-6BW1 - - - See Talos
- SAM-N-6C1 - - - See Talos
- Sammeck - Albert Sammeck - German Engineer -
- Samokutyayev - Aleksandr Mikhailovich Samokutyayev - Russian Pilot Cosmonaut - Energia Engineer Group 15 - 2003
- Samolyot 5 - Spacecraft - Manned - Rocketplane - Russia
- Samonov - Vladimir Ivanovich Samonov - Russian Military Officer -
- Samos - Spacecraft - Surveillance - Military - USA
- SAMPEX - Spacecraft - Earth - Magnetosphere - USA
- San Marco - Spacecraft - Earth - Atmosphere - Italy
- San Marco - Orbital Launch Site in Kenya operated by Italy.
- Sandal - - (ASCC Reporting Name) - See Kosmos 2
- Sandal - Intermediate range ballistic missile - (ASCC Reporting Name) - See Kosmos 2
- Sandys - Duncan Sandys - British Politician -
- Sanger-Bredt - Rocket Engine - Germany - Lox/Kerosene propellant
- Santonico - Stefano Santonico - Italian PSP Cosmonaut - Italian Space Agency Group - 1990
- Sapphire - Spacecraft - Technology - - USA
- Sapwood - - (ASCC Reporting Name) - See Soyuz
- Sapwood - Intercontinental ballistic missile - (ASCC Reporting Name) - See Soyuz
- Saqr-80 - Tactical ballistic missile - Egypt
- SAR-Lupe - Spacecraft - Surveillance - Military Radarsat - Germany
- SARA - Spacecraft - Astronomy - Radio - France
- Sarafanov - Gennadi Vassilyevich Sarafanov - Russian Pilot Cosmonaut - Air Force Group 3 - 1965
- Sark - Submarine-launched ballistic missile - Russia (ASCC Reporting Name) - See R-13
- SARV Retro MK I - Rocket Engine - USA - Solid propellant - See Star 10
- SARV Retro, MK IV - Rocket Engine - USA - Solid propellant - See Star 12
- Saryozek - IRBM Base in Kazakhstan operated by Russia.
- SAS - Spacecraft - Solar - - Italy
- Sasin - - (ASCC Reporting Name) - See R-9
- Sasin - Intercontinental ballistic missile - Russia (ASCC Reporting Name) - See R-9
- SASSTO - SSTO orbital launch vehicle - USA
- Satélite de Aplicaciones Científicas - Spacecraft - Solar - - Argentina - See SAC-B
- Satan - - (ASCC Reporting Name) - See R-36M
- Satan - Intercontinental ballistic missile - Ukraine (ASCC Reporting Name) - See R-36M
- Satcher - Robert Lee 'Bobby' Satcher Jr - African American Mission Specialist Astronaut - NASA Group 19 - 2004
- Satcom - Space Project - Communications -
- Satelite de Aplicaciones/Cientifico-A - Spacecraft - Technology - - Argentina - See SAC-A
- Satelite de Coleta de Dados - Spacecraft - Technology - Communications - Brazil - See SCD
- SAtellite INTerceptor - Spacecraft - Military - ASAT - USA - See SAINT
- Satellite Italiano Ricerca Industriale Orientata - Spacecraft - Technology - Communications - Italy - See Sirio
- Satellite Launch Vehicle - All-solid orbital launch vehicle - India - See SLV
- Satellite pour Astronomie Radio Amateur - Spacecraft - Astronomy - Radio - France - See SARA
- Satellite Probatoire d'Observation de la Terre - Spacecraft - Earth - Landsat - France - See SPOT-1-2-3
- Satellite Probatoire d'Observation de la Terre - Spacecraft - Earth - Landsat - France - See SPOT-4
- Satellite Probatoire d'Observation de la Terre - Spacecraft - Earth - Landsat - France - See SPOT-5A-5B
- Satish Dhawan Space Centre - Orbital Launch Site in India. - See Sriharikota
- Sattarov - Nail Sharipovich Sattarov - Tatar Russian Pilot Cosmonaut - Buran Group 1 - 1978
- Saturn - Launch Vehicle Family
- Saturn Application Single Stage to Orbit - SSTO orbital launch vehicle - USA - See SASSTO
- Saturn C-1 - Orbital launch vehicle - USA - See Saturn I
- Saturn C-5N - Nuclear orbital launch vehicle - - See Saturn V
- Saturn LCB-Alumizine-140 - rocket - See Saturn I
- Saturn LCB-Alumizine-250 - rocket - See Saturn I
- Saturn LCB-Lox/RP-1 - rocket - See Saturn I
- Saturn LCB-Storable-140 - rocket - See Saturn I
- Saturn LCB-Storable-250 - rocket - See Saturn I
- Saturn MLV-V-1/J-2T/200K - rocket - See Saturn V
- Saturn MLV-V-1/J-2T/250K - rocket - See Saturn V
- Saturn MLV-V-4(S) - rocket - See Saturn V
- Saturn MLV-V-4(S)-A - rocket - See Saturn V
- Saturn MLV-V-4(S)-B - rocket - See Saturn V
- Saudisat - Spacecraft - Communications - Amateur Radio - Saudi Arabia
- Saul - Aldo Saul - German Rocket engineer -
- Saurma - Friedrich und Hans Graf von Saurma - German Rocket engineer -
- Saus - Valentin Andreyeich Saus - Russian Military Officer -
- Savage - - (ASCC Reporting Name) - See RT-2
- Savage - Intercontinental ballistic missile - Russia (ASCC Reporting Name) - See RT-2
- SAVER - Spacecraft - Manned - Bailout - USA
- Savin - Anatoli Ivanovich Savin - Russian Chief Designer -
- Savinykh - Viktor Petrovich Savinykh - Russian Engineer Cosmonaut - Energia Engineer Group 5 - 1978
- Savitskaya - Svetlana Yevgenyevna Savitskaya - Russian Engineer Cosmonaut - Female Group - 1980, Energia Engineer Group 6 Supplemental - 1983
- Sawatzki - Albin Sawatzki - German Rocket engineer -
- Sawfly - - (ASCC Reporting Name) - See R-29
- Sawfly - Submarine-launched ballistic missile - Russia (ASCC Reporting Name) - See R-29
- SAX - Spacecraft - Astronomy - X-ray - Italy
- SB-735 - Sounding rocket - Japan
- SBD - Spacecraft - Technology - - USA
- SBIR Hybrid - Rocket Engine - USA - N2O/Solid propellant
- Sbracyvaemiy oporniy konus - Spacecraft - Manned - Spacecraft Module - - See Soyuz 7K-L1 SOK
- SBS - Space Project - Communications -
- Scaleboard - - (ASCC Reporting Name) - See Temp-S
- Scalpel - - (ASCC Reporting Name) - See RT-23
- Scamp - Intermediate range ballistic missile - Russia - See RT-15
- Scapegoat (Scamp) - Intermediate range ballistic missile - Russia (ASCC Reporting Name) - See RT-15
- Scarab-A - - (ASCC Reporting Name) - See Tochka
- Scarab-B - - (ASCC Reporting Name) - See Tochka
- Scarp - - (ASCC Reporting Name) - See Tsiklon
- Scarp - Intercontinental ballistic missile - Ukraine (ASCC Reporting Name) - See Tsiklon
- Scarp - Orbital launch vehicle - (ASCC Reporting Name) - See Tsiklon
- Scarp - Orbital missile - (ASCC Reporting Name) - See Tsiklon
- SCATHA - Spacecraft - Technology - Communications - USA
- SCD - Spacecraft - Technology - Communications - Brazil
- Schabert - Schabert - German Rocket technician -
- Schaper - Otto Friedrich Schaper - German Rocket engineer -
- Scheidt - Karl Scheidt - German Rocket engineer -
- Scheufelen - Klaus Eduard Scheufelen - German Engineer -
- Schilling - Martin Schilling - German Rocket engineer -
- Schindler - William "Bill" Schindler - Manager -
- Schirra - Walter Marty (Wally) Schirra Jr - American Pilot Astronaut - NASA Group 1 - 1959
- Schlechter - Peter Schlechter - German Rocket engineer -
- Schlegel - Hans Wilhelm Schlegel - German Mission Specialist Astronaut - DLR Group 1 - 1987, NASA Group 17 - 1998
- Schlidt - Rudolf Karl Hans Schlidt - German Rocket engineer -
- Schlitt - Helmut Wilhelm Emil Schlitt - German Rocket engineer -
- Schlotzer - Schlotzer - German Rocket engineer -
- Schmidt - Helmut Heinrich Schmidt - German Rocket engineer -
- Schmidt C - C Schmidt - German Rocket engineer -
- Schmidt W - W Schmidt - German Rocket engineer -
- Schmieder - Curt Otto Schmieder - German Professor -
- Schmiedl - Friedrich Schmiedl - German Austrian Engineer -
- Schmitt - Dr Harrison Hagan (Jack) Schmitt - American Scientist Astronaut - NASA Group 4 - 1965
- Schmoll - Schmoll - German Rocket engineer -
- Schnapper - Schnapper - German Rocket engineer -
- Schnarowski - Heinz Ludwig Schnarowski - German Rocket engineer -
- Schneider - William C Schneider - American Manager -
- Scholz - Walter Scholz - German Rocket technician -
- Schomburg - August Schomburg - American Manager -
- Schongs - Bernhard Schongs - German Rocket engineer -
- Schriever - Bernard A Schriever - American Manager -
- Schubert - Schubert - German Rocket engineer -
- Schuesseln - Leo K Schuesseln - German Rocket engineer -
- Schuetz - Wilhelm Schtitz - German Professor -
- Schuler - Albert E Schuler - German Rocket engineer -
- Schulz - Schulz - German Military officer -
- Schulze - August Wilhelm Schulze - German Rocket engineer -
- Schumann - Erich Schumann - German Professor -
- Schuminszky - Nandor Schuminszky - Hungarian Space archivist -
- Schuran - Schuran - German Rocket engineer -
- Schwab - Schwab - German Rocket engineer -
- Schweickart - Russel Luis (Rusty) Schweickart - American Pilot Astronaut - NASA Group 3 - 1963
- Schwidetzky - Walter Hans Schwidetzky - German Rocket engineer -
- Science and Technology Satellite - Spacecraft - Technology - - Korea South - See STSat
- SCISAT - Spacecraft - Earth - Atmosphere - Canada
- Scobee - Francis Richard 'Dick' Scobee - American Pilot Astronaut - NASA Group 8 - 1978
- Score - Spacecraft - Technology - Communications - USA
- Scorpius - Low cost orbital launch vehicle - USA
- Scott - David Randolph (Dave) Scott - American Pilot Astronaut - NASA Group 3 - 1963
- Scott Winston - Winston Elliott Scott - American Mission Specialist Astronaut - NASA Group 14 - 1992
- Scout - All-solid orbital launch vehicle - USA
- Scout F-1 - - - See Scout
- Scout G-1 - - - See Scout
- Scout X-5C - Suborbital launch vehicle - - See Scout
- Scrag - - (ASCC Reporting Name) - See GR-1
- Scrag - Anti-satellite missile - (ASCC Reporting Name) - See GR-1
- Scrag - Intercontinental ballistic missile - (ASCC Reporting Name) - See GR-1
- Scrag - Intercontinental ballistic missile - Russia (ASCC Reporting Name) - See GR-1
- Scramjet - Rocket Engine - USA - Air/Slush LH2 propellant
- Scrooge - Intermediate range ballistic missile - Russia (ASCC Reporting Name) - See RT-20
- Scrooge - Intercontinental ballistic missile - Ukraine (ASCC Reporting Name) - See RT-20P
- Scud A - Submarine-launched ballistic missile - Russia (ASCC Reporting Name) - See R-11
- Scud B - - (ASCC Reporting Name) - See R-11
- Scud B - - (ASCC Reporting Name) - See R-17
- Scud B - rocket - See R-17
- Scud C - Short-range ballistic missile - Russia (ASCC Reporting Name) - See R-17
- Scud D - - (ASCC Reporting Name) - See R-17
- Scud D - rocket - See R-17
- Scully-Power - Paul Desmond Scully-Power - Australian American Payload Specialist Astronaut -
- Scunner - Short range ballistic missile - Russia (ASCC Reporting Name) - See R-1
- SDI - Spacecraft - Military - SDI - USA
- SDS - Spacecraft - Communications - Military - USA
- SDS-2 - Spacecraft - Communications - Military - USA
- SDS-3 - Spacecraft - Communications - Military - USA
- SDS-C - Spacecraft - Communications - Military - USA - See CAPRICORN
- SE-1 - Rocket Engine - USA - N2O4/UDMH propellant
- SE-10 - Rocket Engine - USA - N2O4/Aerozine-50 propellant
- SE-5 - Rocket Engine - USA - N2O4/UDMH propellant
- SE-5-2 - Rocket Engine - USA - N2O4/UDMH propellant - See SE-5
- SE-6 - Rocket Engine - USA - N2O4/MMH propellant
- SE-7 - Rocket Engine - USA - N2O4/MMH propellant
- SE-7-1 - Rocket Engine - USA - N2O4/MMH propellant - See SE-7
- SE-8 - Rocket Engine - USA - N2O4/MMH propellant
- SE-9 - Rocket Engine - USA - N2O4/Aerozine-50 propellant
- SE.4100 - Surface-to-air missile - France
- SE.4300 - Surface-to-air missile - France
- SE.4350 - Surface-to-air missile - France
- SE.4400 - Surface-to-air missile - France
- Sea Bee - Sea-launched test vehicle - USA
- Sea Dragon - Heavy-lift orbital launch vehicle - USA
- Sea Dragon-1 - Rocket Engine - USA - Lox/Kerosene propellant
- Sea Lance - - - See Lance
- Sea Launch - Orbital Launch Site in USA. - See Kiritimati
- Sea Slug Mk. 1 - rocket - See Seaslug
- Sea Slug Mk. 2 - rocket - See Seaslug
- Sea Star - Sea-launched orbital launch vehicle - USA
- Seaborg - Glenn T Seaborg - American Manager -
- SEALAR - Sea-launched orbital launch vehicle - USA
- Seamans - Robert C Seamans, Jr - American Manager -
- Searfoss - Richard Alan (Rick) Searfoss - American Pilot Astronaut - NASA Group 13 - 1990
- Seasat - Spacecraft - Earth - Radarsat - USA
- Seaslug - Surface-to-air missile - UK
- SeaStar; SeaWiFS - Spacecraft - Surveillance - Civilian - USA - See Orbview-2
- Seba Oasis - Suborbital Launch Site in Libya operated by Germany. - See Tawiwa
- Sechkin - Aleksey Semenovich Sechkin - Russian Military Officer -
- SECOR - Spacecraft - Earth - Geodetic - USA
- SECS - Spacecraft - Communications - Military Store-dump - USA - See GLOMR
- SECS/OTS - Spacecraft - Communications - Military - UK
- Seddon - Dr Margaret Rhea Seddon - American Mission Specialist Astronaut - NASA Group 8 - 1978
- Sedov - Leonid Ivanovich Sedov - Russian Scientist -
- SEDS - Spacecraft - Technology - Tether - USA
- SEDSAT - Spacecraft - Technology - - USA
- See - Elliott McKay See Jr - American Pilot Astronaut - NASA Group 2 - 1962
- Seeler - H Seeler - German Engineer -
- Sefchek - Paul Andrew Sefchek - American Manned Spaceflight Engineer Astronaut - DoD Group 1 - 1979
- Sega - Dr Ronald Michael (Ron) Sega - American Mission Specialist Astronaut - NASA Group 13 - 1990
- Sego - - (ASCC Reporting Name) - See UR-100
- Sego - Intercontinental ballistic missile - Russia (ASCC Reporting Name) - See UR-100
- Seidel - Joachim Seidel - German Rocket engineer -
- Seliger - Berthold Seliger - German German Engineer -
- Seliger - Sounding rocket - Germany
- Seliger 1 - Rocket Engine - Germany - Solid propellant
- Seliger 3 - Rocket Engine - Germany - Solid propellant
- Sellers - Piers John Sellers - American Mission Specialist Astronaut - NASA Group 16 - 1996
- Sembach AB - IRCM Base in Germany operated by USA.
- Semenov - Anatoli Ivanovich Semenov - Russian Military Officer -
- Semyorka - Intercontinental ballistic missile - - See Soyuz
- Semyorka - Intercontinental ballistic orbital launch vehicle - - See Soyuz
- Sendai - Suborbital Launch Site in Japan operated by .
- Sendler - Karl Sendler - German Rocket engineer -
- Senior - Rocket Engine - USA - Solid propellant - See Algol
- Senkevich - Dr Yuri Aleksandrovich Senkevich - Russian Physician Cosmonaut - Voskhod Physician Group - 1965
- Sentry - Anti-ballistic missile - USA
- SEP 401 - Rocket Engine - France - Solid propellant
- SEP 402 - Rocket Engine - France - Solid propellant
- SEP 403 - Rocket Engine - France - Solid propellant
- SEP 901 - Rocket Engine - France - Solid propellant
- SEP 902 - Rocket Engine - France - Solid propellant
- SEP 903 - Rocket Engine - France - Solid propellant
- SEP 904 - Rocket Engine - France - Solid propellant
- SEPR 2 - Rocket Engine - France -
- SEPR 200 - Rocket Engine - France - Solid propellant - See Tramontane
- SEPR 685-4 - Rocket Engine - France - Solid propellant
- SEPR 732 - Rocket Engine - France - Solid propellant
- SEPR 734 - Rocket Engine - France - Solid propellant
- SEPR 737 - Rocket Engine - France - Solid propellant
- SEPR 739 - Rocket Engine - France - Solid propellant
- SEPR 739 - Rocket Engine - France - Solid propellant - See Stromboli
- SEPR 740 - Rocket Engine - France - Solid propellant
- SEPR P163 - Rocket Engine - France - Solid propellant
- SEPR P167 - Rocket Engine - France - Solid propellant
- SEPR P191 - Rocket Engine - France - Solid propellant
- SEPS - Rocket Engine - USA - Electric/Mercury propellant
- SEPST - Rocket Engine - USA - Electric/Mercury propellant
- Serb - - (ASCC Reporting Name) - See R-21
- Serb - Submarine-launched ballistic missile - Russia (ASCC Reporting Name) - See R-21
- Serb - - (ASCC Reporting Name) - See R-27
- Serb - Submarine-launched ballistic missile - Russia (ASCC Reporting Name) - See R-27
- Serbin - Ivan Dmitryevich Serbin - Russian Government Official -
- Serebrov - Aleksandr Aleksandrovich Serebrov - Russian Engineer Cosmonaut - Energia Engineer Group 5 - 1978
- Sergeant - Rocket Engine - USA - Solid propellant
- Sergeant - Short range ballistic missile - USA
- Sergeyev - Vladimir Grigoryevich Sergeyev - Russian Military Officer -
- Serov - Ivan Aleksandrovich Serov - Russian Government Official -
- Serov Mark - Mark Vyacheslavovich Serov - Russian Engineer Cosmonaut - Energia Engineer Group 15 - 2003
- Serova - Elena Olegovna Serova - Russian Engineer Cosmonaut - Energia Engineer Group 16 - 2006
- SERT - Spacecraft - Technology - Ion engine - USA
- Sert II - Rocket Engine - USA - Electric/Mercury propellant
- SERV - VTOVL orbital launch vehicle - - See Shuttle
- Service Module - Spacecraft - Manned - Spacecraft Module - - See Apollo SM
- Service Module - Spacecraft - Manned - Spacecraft Module - USA - See CEV SM
- Service Module - Spacecraft - Manned - Spacecraft Module - - See Gemini LORV SM
- Service Module - Spacecraft - Manned - Spacecraft module - - See Kvant FGB
- Service Module - Spacecraft - Manned - Spacecraft Module - - See MRC SM
- SERVIS - Spacecraft - Technology - - Japan
- SESP - Spacecraft - Technology - Military - USA
- Sevastyanov - Vitali Ivanovich Sevastyanov - Russian Engineer Cosmonaut - Energia Engineer Group 1 Supplemental - 1967
- Sever - Spacecraft - Manned - Spacecraft - Russia
- Severin - Gay Ilich Severin - Russian Engineer -
- Severin Vladimir - Vladimir Gayevich Severin - Russian Engineer Cosmonaut - Zvezda Engineer Group - 1990
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