Decay may refer to:
Science and technology Bit decay, in computing Decay time (fall time), in electronics Distance decay, in geography Software decay, in computing
Biology Decomposition of organic matter Mitochondrial decay, in genetics Tooth decay (dental caries), in dentistry
Physics Optical decay, in quantum physics Orbital decay, the process of prolonged reduction in the height of a satellite's orbit Particle decay Radioactive decay False vacuum decay
Mathematics Exponential decay
Psychology and sociology Decay theory, in psychology and memory Social decay (decadence), in sociology Urban decay, in sociology
Entertainment
Network decay (channel drift), in television programming Decay (DC Comics), a comic book character Decay (comics), a Marvel Comics character and member of the Acolytes Decay (X-Factor), a Marvel Comics character and member of Serval X-Factor Half-Life: Decay, a 2001 video game add-on Deekay, a Danish production team Decay (professional wrestling), a professional wrestling stable in TNA Wrestling
Film Decay (2012 film), a 2012 zombie film set at the Large Hadron Collider Decay (2015 film), a 2015 American film
Music
how quickly the sound drops to the sustain level after the initial peak, see ADSR envelope Decay (Wretched album), 2025 Decay (Godflesh album), 2026 "Decay" (Ride song) "Decay" (Biohazard song) "Decay" (Sevendust song), 2013 Decay Music, 1976 album by Michael Nyman In Decay, 2012 album by Com Truise The Years of Decay, 1989 album by Overkill (band)
Other Beta decay (finance)
See also Weathering Decomposition (disambiguation)