Inner space may mean:

• Destination Inner Space (1966), American science fiction film
• Taylor's Inner Space (1974), a television series by Ron and Valerie Taylor
• Innerspace (1987), a sci-fi comedy film
• Operation: Inner Space (1994), a computer game
• InnerSPACE (2009—2018), a Canadian television show
• Innerspace (video game) (2018), an adventure video game

• Inner space, a science fiction genre related to psychological fiction

• Adventure Thru Inner Space, a 1967 attraction at Disneyland
• Inner Space Cavern, a Karst cave in Georgetown, Texas, USA

• Inner Space (album) (1973), an album by Chick Corea
• Can (album) (a.k.a. Inner Space) (1979), an album by Can
• "Innerspace", a song by The Apples in Stereo on their album Fun Trick Noisemaker (1995)
• "Innerspace", a song by Mirror (2022)

• Priam InnerSpace, a hard disk drive series by Priam Corporation in the 1980s

• Inner product space, a kind of vector space in linear algebra
• Lumen (anatomy), an inner space, lining, or cavity
• Outer space (disambiguation)