a short story by Thomas Pynchon

Thermodynamic entropy, the thermodynamic homogeneity of a system, limiting the ability to extract mechanical work

Information entropy, in statistics, the amount of information that is lacking in a random variable

Entropy (classical thermodynamics), macroscopic understanding of thermodynamic entropy

"Entropy" (Buffy episode), an episode of the TV series Buffy the Vampire Slayer

Entropy (statistical thermodynamics), microscopic understanding of thermodynamic entropy

a song by MC Hawking

Entropy (computing), an indicator of the number of random bits available to seed cryptography systems

a song on the album Against the Grain by Bad Religion

von Neumann entropy, entropy of a quantum-mechanical system

Boltzmann entropy formula, S = k ln W

Renyi entropies, family of diversity measures generalising Shannon entropy; used to define fractal dimensions

a song on the b album by Moxy Früvous

Entropy encoding, data compression strategies that set out to achieve message lengths close to the Shannon entropy

Entropy (Hip Hop Reconstruction from the Ground up), Hip-Hop Suite by DJ Shadow and the Groove Robbers

Topological entropy, a measure of exponential growth in dynamical systems; equivalent to the rate of increase of α->0 Renyi entropy of a trajectory in trajectory-space

Gibbs entropy, statistical entropy of a thermodynamic system

Entropy (ecology), use of Shannon entropy as a measure of biodiversity in the study of ecology

Entropy (board game), the name of two board games

Entropy (anonymous data store), a computer network designed to be resistant to censorship

Entropy (monitor) a monitor of anaesthetic depth using analysis of a 2 lead EEG

Entropy (2006 film), an independent film shot in South-Eastern Wisconsin.

a song on the album Matter + Form by VNV Nation

Entropy (film), a 1999 film directed by Phil Joanou.

Entropy (album), a split vinyl album by Anathallo and Javelins

Entropy ry., a student organization for electronic music at Helsinki University of Technology