11th dimension

11th dimension may refer to:


 * 11-dimensional supergravity, a field theory that combines the principles of supersymmetry and general relativity.
 * 11-dimensional spacetime, which appears in M-theory, a proposed "master theory" that unifies the five superstring theories
 * Introduction to M-theory
 * "11th Dimension" (song), by Julian Casablancas, 2009
 * 11th Dimension (album), by Ski Mask the Slump God, 2024