Loss may refer to:
- 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
 - Switching loss, power loss incured due to circuit switching
 - Lick Observatory Supernova Search (LOSS) program
 
Proper noun in Arts, entertainment, and media
Music
Albums
Songs
- "Losses" (Lil Tjay song) (2020)
 - "Loss", a song by God Is an Astronaut from their self-titled album (2008)
 - "Loss", a song by Madder Mortem from Mercury (1999)
 - "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 (comic), 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
- Joe Loss (1909–1990), founder of The Joe Loss Orchestra
 - Loss (baseball), a pitching statistic in baseball
 - League of Secessionist States (LoSS), an intermicronational organisation
 
See also
Wikiquote has quotations related to Loss.
- Attenuation, a reduction in amplitude and intensity of a signal
 - Lose (disambiguation)
 - Losing (disambiguation)
 - Stop loss (disambiguation)
 
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