LGS
LGS is an abbreviation for:
- State horticultural show
- Laser Guide Star , see Artificial Guide Star , an aid for astronomical telescopes
- Lennox-Gastaut syndrome , a form of epilepsy
- Lëtzebuerger Guiden a Scouten , a Luxembourg scout association
- Linear system of equations
- Local Group Suspected , see Pisces dwarf galaxy
