LSA is an acronym standing for:

• Latent semantic analysis
• Lichen sclerosus et atrophicus (Skin disease)
• Light-sport aircraft
• Linguistic Society of America
• Link-state advertisement
• Linseed Sunflower Almond, a mix used in Dr Sandra Cabot's Liver Cleansing Diet (Linseed is called Flaxseed in the USA)
• Local Security Authority, the centre of the Windows NT security subsystem (lsass.exe).
• Local Spiritual Assembly, an administrative body of the Bahá'í Faith.
• Lute Society of America
• d-Lysergic acid amide
• College of Literature, Science, and the Arts at the University of Michigan
• Licensiute of the Society of Apothecaries

LSA