Please read the information about this list on User:SirJective/Parenthesis before working with it!
- X Marks the Spot (radio programme) - X Marks the Spot
- XCOM (computer game) (r) - XCOM
- XLR-11 (rocket engine) - XLR-11
- XLR-99 (rocket engine) - XLR-99
- Yale school (deconstruction) - Yale school
- Yamato gun (StarCraft) - Yamato gun
- Yambol (region) - Yambol
- Yan O (MTR) - Yan O
- Yellow House Pub (Dublin) - Yellow House Pub
- Yerkes (crater) - Yerkes
- Yokai list (InuYasha) - Yokai list
- You're Welcome (Angel episode) - You're Welcome
- You Need More Money (Book) - You Need More Money
- Youkai list (InuYasha) (r) - Youkai list
- Young Conservatives (UK) - Young Conservatives
- Zöllner (crater) - Zöllner
- Zach (crater) - Zach
- Zack (ffvii) - Zack
- Zagut (crater) - Zagut
- Zanstra (crater) - Zanstra
- Zasyadko (crater) - Zasyadko
- Zeeman (crater) - Zeeman
- Zelinskiy (crater) - Zelinskiy
- Zerega Avenue (New York Subway) - Zerega Avenue
- Zernike (crater) - Zernike
- Zhukovskiy (crater) - Zhukovskiy
- Ziarul Crisana (Romanian newspaper) (r) - Ziarul Crisana
- Zinner (crater) - Zinner
- ZM, (New Zealand) - ZM,
- Zsigmondy (crater) - Zsigmondy
- Zucchius (crater) - Zucchius
- Zuma (1975 album) - Zuma
- Zupus (crater) - Zupus
- Zwicky (crater) - Zwicky