LGS may refer to:

Education

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

This disambiguation page lists articles associated with the title LGS.
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