LSM

LSM is a three letter abbreviation that may refer to:

• Landing Ship, Medium, a form of amphibious assault ship
• "Laser Scanning Microscopy" (see Confocal laser scanning microscopy), a type of microscopy in which laser light is used for illumination
• Layered synthetic microstructure, a diffracting medium in long wavelength X-ray spectrometry
• The Lesbian Sex Mafia, a women-only BDSM organization
• Linux Security Modules, a project providing a lightweight, general purpose framework for access control on Linux
• Linux Software Map, a standard text format for describing Linux software
• Living Stream Ministry, the non-profit publisher
• Lutheran Student Movement, a pan-Lutheran student led organization active at the local, regional, and national level.

.lsm is a filename extension that may refer to:

• image files produced by the Zeiss LSM line of confocal microscopes
• text files in the Linux Software Map format