LGS

LGS may refer to:

Schools

 * Lahore Grammar School
 * Lanark Grammar School
 * Langley Grammar School
 * Larne Grammar School
 * Leeds Grammar School
 * Leicester Grammar School
 * Limavady Grammar School
 * Loughborough Grammar School, one of the Loughborough Endowed Schools

Other

 * Liselere Geçiş Sınavı, the old name for OKS.
 * Local gaming store. A store to play or purchase board games.

Entertainment

 * Looking Glass Studios, a defunct computer game company
 * La Grande Sophie, a French singer-songwriter

Science

 * Laser guide star, an adaptive optics instrument used in Astronomy
 * Leaky gut syndrome, an intestinal dysfunction
 * LGS Innovations, a high-tech private company and former division of Bell Labs
 * Latitudinal Gradients in Species diversity
 * Lennox–Gastaut syndrome, a type of epilepsy
 * Light Gauge Steel, also called cold-formed steel

Software

 * Logitech Gaming Software, a driver style software for Logitech Gaming products