{{Wiktionary|loss|lose}} '''Loss''' may refer to:
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*Economic loss *Grief, an emotional response to loss **Animal loss, grief over the loss of an animal
==Mathematics, science, and technology== *Angular misalignment loss, power loss caused by the deviation from optimum angular alignment *Bridging loss, the loss that results when an impedance is connected across a transmission line *Coupling loss, the loss that occurs when energy is transferred from one circuit, optical device, or medium to another *Insertion loss, the decrease in transmitted signal power resulting from the insertion of a device in a transmission line or optical fiber *Dielectric loss, a dielectric material's inherent dissipation of electromagnetic energy *Loss function, in statistics, a function representing the cost associated with an event *Path loss, the attenuation undergone by an electromagnetic wave in transit from a transmitter to a receiver **Free-space path loss, the loss in signal strength that would result if all influences were sufficiently removed having no effect on its propagation *Return loss, the ratio of the amplitude of the reflected wave to the amplitude of the incident wave *Round-trip loss in laser physics refers to energy lost due to scattering or absorption *{{ill|Switching loss|de|Schaltverluste}}, power loss incured due to circuit switching *Lick Observatory Supernova Search (LOSS) program
==Arts, entertainment, and media== ===Music=== ====Albums==== *''Loss'' (Bass Communion album) (2006) *''Loss'' (Mull Historical Society album) (2001)
====Songs==== *"Losses" (song), 2020 song by Lil Tjay *"Loss", a song by God Is an Astronaut from their self-titled album (2008) *"Loss", a song by Madder Mortem from ''Mercury'' (1999) *"Loss", a song by Underoath from ''The Place After This One'' (2025) *"Losses", a song by Drake from ''Dark Lane Demo Tapes'' (2020) *"Losses", a song by Polo G from ''Hall of Fame'' (2021)
===Other uses in arts, entertainment, and media=== *"Loss" (''Ctrl+Alt+Del''), a webcomic strip and internet meme *''Loss'' (film), a 2008 film by Maris Martinsons *Lord Loss (character), a character from Darren Shan's ''The Demonata'' *"The Loss", a 1990 episode of ''Star Trek: The Next Generation''
==Other uses== *Loss (surname) *Loss (baseball), a pitching statistic in baseball *League of Secessionist States (LoSS), an intermicronational organisation
== See also == {{Wikiquote}} *Attenuation, a reduction in amplitude and intensity of a signal *Lose (disambiguation) *Lost (disambiguation) *Losing (disambiguation) *Stop loss (disambiguation)
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