- Bell 8096 - Rocket Engine - USA - Nitric acid/UDMH propellant - See Bell 8000
- Yablontsev - Aleksandr Nikolaevich Yablontsev - Russian Pilot Cosmonaut - Buran Group 3 - 1989, Chkalov Group 3 - 1992
- YaERD-2200 - Rocket Engine - Russia - Nuclear/LH2 propellant
- YaKhR-2 - Nuclear-powered orbital launch vehicle - Russia
- Yakhta - Spacecraft - Communications - - Russia
- Yakovlev - Oleg Anatolyevich Yakovlev - Russian Pilot Cosmonaut - Air Force Group 3 - 1965
- Yamal - Spacecraft - Communications - - Russia
- Yamal - Orbital launch vehicle - Russia - See Soyuz
- Yamazaki - Naoko Yamazaki (nee Sumino) - Japanese Engineer Astronaut - NASDA Group 3 - 1999, NASA Group 19 - 2004
- Yamsat - Spacecraft - Technology - - Taiwan
- Yang Liwei - Yang Liwei - Chinese Pilot Yuhangyuan - China Group 1 - 1998
- Yangel - Mikhail Kuzmich Yangel - Russian Engineer -
- Yantar FR6 - Spacecraft - Surveillance - Military - Russia - See Orlets-1
- Yantar-1 - Spacecraft - Surveillance - Military - Russia
- Yantar-1KF - Spacecraft - Surveillance - Military - Russia
- Yantar-1KFT - Spacecraft - Surveillance - Military - Russia
- Yantar-2 - Spacecraft - Surveillance - Military - Russia
- Yantar-2K - Spacecraft - Surveillance - Military - Russia
- Yantar-2K-M - Spacecraft - Surveillance - Military - Russia
- Yantar-3KF - Spacecraft - Surveillance - Military - Russia
- Yantar-4 - Spacecraft - Surveillance - Military - Russia - See Yantar-4K2
- Yantar-4K1 - Spacecraft - Surveillance - Military - Russia
- Yantar-4K2 - Spacecraft - Surveillance - Military - Russia
- Yantar-4KS1 - Spacecraft - Surveillance - Military - Russia
- Yantar-4KS2 - Spacecraft - Surveillance - Military - Russia
- Yantar-6K - Spacecraft - Surveillance - Military - Russia - See Orlets-1
- Yantar-6K - Spacecraft - Surveillance - Military - Russia
- Yantar-6KS - Spacecraft - Surveillance - Military - Russia
- Yaogan - Spacecraft - Surveillance - Military Radarsat - China
- YaRD ICBM - Intercontinental range ballistic missile - Russia
- YaRD OKB-456 - Rocket Engine - Russia - Nuclear/Ammonia propellant
- YaRD OKB-670 - Rocket Engine - Russia - Nuclear/Ammonia+Alcohol propellant
- YaRD Type A - Rocket Engine - Russia - Nuclear/LH2 propellant
- YaRD Type AF - Rocket Engine - Russia - Nuclear/LH2 propellant
- YaRD Type V - Rocket Engine - Russia - Nuclear/LH2 propellant
- Yardbird - Rocket Engine - USA - Solid propellant
- Yardley - John Finley Yardley - American Manager -
- Yaroshenko - Georgi L Yaroshenko - Soviet Physician Cosmonaut - Voskhod Physician Group - 1965
- Yashin - Yuri Alekseyevich Yashin - Russian Military Officer -
- Yasinskiy - Aleksandr Filippovich Yasinskiy - Russian Military Officer -
- Yastreb - Spacecraft - Manned - Space Suits - Russia
- Yastrebov - Vladimir Dmitrevich Yastrebov - Russian Military Officer -
- Yazdovskiy - Vladimir Ivanovich Yazdovskiy - Russian Military Officer -
- Yazdovsky - Valeri Aleksandrovich Yazdovsky - Russian Engineer Cosmonaut - Energia Engineer Group 2 - 1967
- Ye-8 - Spacecraft - Planetary - Lunar Rover - Russia - See Luna Ye-8
- Ye-8-5 - Spacecraft - Planetary - Lunar Lander - Russia - See Luna Ye-8-5
- Ye-8-5M - Spacecraft - Planetary - Lunar Lander - Russia - See Luna Ye-8-5M
- Ye-8-LS - Spacecraft - Planetary - Lunar Orbiter - Russia - See Luna Ye-8-LS
- Yeager - Charles E Yeager - American Pilot Test Pilot - Test Pilot (USAF)
- Yeakel - Glenn Scott Yeakel - American Manned Spaceflight Engineer Astronaut - DoD Group 2 - 1982
- Yebenov - Profiri Yebenov - Phantom cosmonaut - Phantom Cosmonaut
- Yefremov - Gerbert Aleksandrovich Yefremov - Russian Engineer -
- Yefremova - Yefremova - Soviet Engineer Cosmonaut - Female Group - 1962
- Yegorov - Dr Boris Borisovich Yegorov - Russian Physician Cosmonaut - Voskhod Group - 1964
- Yeliseyev - Aleksei Stanislavovich Yeliseyev - Russian Engineer Cosmonaut - Energia Engineer Group 1 - 1966
- Yeltsin - Boris N Yeltsin - Russian Manager -
- Yemelyanov - Sergei Aleksandrovich Yemelyanov - Russian Engineer Cosmonaut - Energia Engineer Group 7 - 1984
- Yerkina - Zhanna Dmitriyevna Yerkina - Russian Pilot Cosmonaut - Female Group - 1962
- Yershov - Valentin Gavriyilovich Yershov - Russian Scientist Cosmonaut - Academy of Sciences Group 1 - 1967
- YES - Spacecraft - Technology - Tether - Europe
- Yesenkov - Sergei Vasilyevich Yesenkov - Russian Military Officer -
- YF-1 - Rocket Engine - China - Nitric acid/kerosene propellant
- YF-120t - Rocket Engine - China - Lox/Kerosene propellant
- YF-2 - Rocket Engine - China - Nitric acid/UDMH propellant
- YF-20 - Rocket Engine - China - N2O4/UDMH propellant
- YF-22 - Rocket Engine - China - N2O4/UDMH propellant
- YF-23 - Rocket Engine - China - N2O4/UDMH propellant
- YF-25 - Rocket Engine - China - N2O4/UDMH propellant
- YF-3 - Rocket Engine - China - N2O4/UDMH propellant
- YF-40 - Rocket Engine - China - N2O4/UDMH propellant
- YF-50t - Rocket Engine - China - Lox/LH2 propellant
- YF-73 - Rocket Engine - China - Lox/LH2 propellant
- YF-75 - Rocket Engine - China - Lox/LH2 propellant
- Yi So-yeon - Yi So-yeon - Korean Korean Engineer Cosmonaut - Korean Group - 2007
- YLR113-AJ-1 - Rocket Engine - USA - - See AJ10-51
- YLR44-RM-1 - Rocket Engine - USA - - See LR44
- YLR45-AJ-1 - Rocket Engine - USA - Nitric acid/Kerosene propellant - See LR45
- YLR45-AJ-3 - Rocket Engine - USA - Nitric acid/Kerosene propellant - See LR45
- YLR45AJ-3 - Rocket Engine - USA - Nitric acid/Kerosene propellant - See LR45
- YLR47-K-1 - Rocket Engine - USA - - See LR47
- YLR63-AJ-3 - Rocket Engine - USA - Nitric acid/UDMH propellant - See LR63
- YLR63AJ-3 - Rocket Engine - USA - Nitric acid/UDMH propellant - See LR63
- YLR81-BA - Rocket Engine - USA - Nitric acid/UDMH propellant - See Bell 8000
- York - Herbert F York - American Manager -
- Young - John Watts Young - American Pilot Astronaut - NASA Group 2 - 1962
- Young Jack - John ("Jack") Donald Young - American Manager -
- Young Lawrence - Lawrence Retman Young - American Payload Specialist Astronaut -
- Yu Guilin - Yu Guilin - Chinese Pilot Yuhangyuan - Shuguang Group - 1970
- Yug - Spacecraft - Military - Target - Ukraine - See Taifun-2
- Yug - Spacecraft - Military - Target - Ukraine - See Taifun-1Yu
- Yuhangyuan 1? - Yuhangyuan 1? - Chinese Pilot Yuhangyuan - China Group 1 - 1998
- Yuhangyuan 2? - Yuhangyuan 2? - Chinese Pilot Yuhangyuan - China Group 1 - 1998
- Yuma - Suborbital Launch Site in USA operated by .
- Yuma Proving Ground - Suborbital Launch Site in USA operated by . - See Yuma
- Yurchikhin - Fyodor Nikolayevich Yurchikhin - Russian Engineer Cosmonaut - Energia Engineer Group 14 - 1997
- Yuri - Spacecraft - Technology - Communications - Japan
- Yurya - ICBM Base in Russia.
- Yuyukov - Dmitri Andreyevich Yuyukov - Russian Engineer Cosmonaut - Almaz Engineer Group 2 - 1973
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© Mark Wade, 1997 - 2008 except where otherwise noted.
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