LS may refer to:

Arts and entertainment

• Lunar Strain, a 1994 album by Swedish melodic death metal band In Flames
• "The Lightning Strike", a song by Snow Patrol
• Lost Souls (online game), a MUD, or text-based online role-playing game

Businesses

• LS Group, a Korean company
• Jet2.com, a British airline (IATA code LS)

Latin

• Lewis and Short, authors of A Latin dictionary
• Lectori Salutem (L.S.), Latin for 'Greetings Reader' and used as opening words to a letter
• locus sigilli, Latin for 'place of the seal', used in notarized and legal documents; see: Seal (contract law)

Organizations

• Liberal Party of Croatia
• Lincoln-Sudbury Regional High School, Massachusetts, US
• Lok Sabha, the lower house of the Parliament of India
• Loyola Schools, the college unit of the Ateneo de Manila University in Quezon City, Philippines

People

• Larry Sanger, co-founder of Wikipedia
• Lady Sovereign, a British performance artist
• Lemony Snicket, pen name of American novelist Daniel Handler (born 1970)
• Lewis and Short, authors of A Latin Dictionary

Places

• Lesotho, ISO 3166-1 country code
• LS postcode area, UK, covering Leeds
• County Laois, Ireland

Science, technology, and mathematics

Astronomy

• Light-second, a unit of length in astronomy
• Local Supercluster, our galaxy supercluster
  • Virgo Supercluster, our galaxy supercluster

Biology and medicine

• Lung surfactant, a lipoprotein complex
• Legius syndrome, also known as Neurofibromatosis 1-like syndrome, a genetic disorder
• Lichen sclerosus, a skin disease
• Linnean Society of London, postnominal LS
• Live sand, in aquaria, sand populated with bacteria and organisms to aid in dissolving organic wastes

Computing and electronics

• ls, a command specified by POSIX and by the Single UNIX Specification; used for listing files
• .ls, the internet top-level domain for Lesotho
• Link-state routing protocol, used in packet-switching networks
• Location Services, a component of Microsoft's System Center Configuration Manager software
• LS, a low-power Schottky version of a 7400 series chip

Engineering

• Land Surveyor

Mathematics

• Least squares, a regression analysis
• Löwenheim–Skolem theorem, a theorem in first-order logic dealing with the cardinality of models

Physics

• LS coupling, interaction between quantum numbers

Transportation

• LS, a generic trim of Chevrolet vehicles
• LS, a model prefix on sailplanes made by Rolladen-Schneider Flugzeugbau GmbH
• LS 90, a Czech and Slovak train protection system
• Lexus LS, the flagship, full-size sedan made by Lexus
• Lincoln LS, a model of car made from 2000 to 2006
• GM LS engine, a V-8 engine in General Motors cars

Other uses

• La Salle (disambiguation), several places and educational institutions
• Latvian lats, former currency of Latvia
• LaVeyan Satanism, a religious group
• Leading Seaman, a junior non-commissioned rank in several navies
• Logistics Specialist, a rating in the United States Navy
• Long snapper, a special teams player in American football