LGS
LGS is an abbreviation for:
- Regional Garden Show
- Laser Guide Star, see artificial guide star, a tool for astronomical telescopes
- Lennox -Gastaut syndrome, a form of epilepsy
- Lëtzebuerger Guiding a scouting, a Luxembourg Boy Scouts Association
- Linear system of equations
- Local Group Suspected, see Pisces Dwarf Galaxy
- Disambiguation
- Abbreviation