Subspace may refer to:

Mathematics

• Euclidean subspace, in linear algebra, a set of vectors in n-dimensional Euclidean space that is closed under addition and scalar multiplication.
• Linear subspace, in linear algebra, a subset of a vector space that is closed under addition and scalar multiplication
• Subspace topology, in topology and related areas of mathematics

Science Fiction

• Hyperspace (science fiction), a fictional dimension in science fiction sometimes referred to as subspace
• Subspace (Star Trek), a medium for faster-than-light communications or travel

Games

• SubSpace (video game), a two-dimensional space shooter computer game
• The Subspace Emissary, the single player Adventure mode in the video game Super Smash Bros. Brawl.
• Subspace - The Captain's Chair, a strategy computer game published in 2001 by Crystal Interactive

Other

• Subspace (BDSM), the psychological state of the submissive partner in a BDSM scene
• Subspace (song), a single by Funker Vogt

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