LGM

LGM can be
Last Glacial Maximum
Lady International Correspondence Chess Grand Master
Lao Gan Ma
LGM (movie) or Let's Get Married, an Indian Tamil-language romantic drama movie
Libre Graphics Meeting
Little green men, a stereotypical portrayal of extraterrestrials
Little Green Men Games
Let's Go Mets, a common chant at New York Mets baseball games

LGM-1, a pulsar, also referred to as LGM
LGM-2, a star with anomalous variations in brightness
LGM-25 Titan I, a rocket or ICBM
LGM-25C Titan II ICBM
LGM-30 Minuteman ICBM
LGM-118 Peacekeeper ICBM
Little Green Men (disambiguation)