LAS may stand for:

• L.A. Symphony, a Christian hip hop group from Los Angeles
• League of Arab States, an international organization of Arab nations
• Legal Aid Society, an American provider of legal services
• Leysin American School, a boarding school in Switzerland
• Líneas Aéreas Suramericanas, an airline based in Bogotá, Colombia
• Log ASCII Standard, a standard digital format for wellbore logs in the petroleum industry
• London Ambulance Service, an emergency service in London
• Lymphadenopathy syndrome, an AIDS related syndrome
• McCarran International Airport, an airport in Las Vegas, Nevada with IATA code LAS
• Association of Lithuanian Automobilists, a member of the FIA
• Linear Alkylbenzene Sulfonate, a kind of surfactant widely used in detergents and other cleaning products
• Low affinity site, a region of DNA to which RNA polymerase binds to when not in use
• Lucasfilm Animation Singapore, a Lucasfilm studio dedicated to the Clone Wars TV 3D series, movie effects and video games.

Las may refer to:

• Las, a character in Greek mythology, killed by Patroclus
• Las Vegas, Nevada
• Las, Lublin Voivodeship, a village in eastern Poland
• Las, Silesian Voivodeship, a village in southern Poland
• Las, Gliwice County, a village also in Silesian Voivodeship, southern Poland
• Łaś, Masovian Voivodeship (east-central Poland)