Space dust may refer to:

• Cosmic dust, particles floating in space
• Space debris, or human-made objects abandoned in space
• Regolith, loose particulate soil of which dust is a main component, typically in reference to extraterrestrial bodies
  • Lunar soil (Moon dust)

• Spacedust, a British music production duo
• Space Dust, a New Zealand space rock band formed in 1993
• "Space Dust", a song by Hawkwind

• Space Dust, a 1970s confectionery brand
• Slang for crack cocaine dipped in PCP; see List of polysubstance combinations

• Stardust (disambiguation)