LSA or Lsa is an acronym standing for:

• Licence of the Society of Apothecaries
• Light: Science & Applications, a scientific journal
• Student Union of Latvia (Latvijas Studentu apvienība)

• University of Michigan College of Literature, Science, and the Arts
• University of Liverpool School of Architecture, England, UK
• La Salle Academy, a Catholic, all-boys high school in New York
• Lakshmipat Singhania Academy, a non-profit school group in India

• Light Small Arms
• Logistics Support Analysis, a military support planning methodology
• Logistics Support Area, a large military depot
• London Small Arms Co. Ltd, an English gun-making firm between 1866 and 1935
• Lubricant, Semi-fluid, Automatic Weapons, MIL-L-46000

• Law and Society Association
• Law Society of Alberta
• League for Socialist Action, a Canadian political group active in the 1960s and 70s
• Learn and Serve America, a U.S. government community service program
• Licentiate of the Society of Apothecaries
• Linguistic Society of America
• Lithuanian Space Association, Lithuania's space agency
• Luxembourg Space Agency, national space agency of the Grand-Duchy of Luxembourg
• Local Spiritual Assembly, an administrative body of the Bahá'í Faith
• Lone Scouts of America, an independent Scouting organization that merged into the Boy Scouts of America
• Lone Star Alliance, lacrosse-only athletic conference
• Lutheran Services in America, the largest network of human service organizations in the United States
• Student Union of Latvia (Latvijas Studentu apvienība)

• London Stansted Airport
• Lytham St. Annes, seaside town in Lancashire, England
• LSA, IATA airport code of Losuia Airport in Papua New Guinea

• Late Stone Age
• Least squares adjustment
• Anterolateral central arteries of the brain
• Lichen sclerosus et atrophicus, a skin disease
• Light-sport aircraft
• Lobe Separation Angle, see cam
• Lsa, the abbreviation for the orchid genus Luisia
• Lysergic acid amide (ergine), a compound closely related to LSD
• Lötfrei, schraubfrei, abisolierfrei, an insulation-displacement connector for telecommunications
• Liver stage antigen, a set of peptides
• Low specific activity, radioactive substances produced by oil and gas production installations. Also referred to as NORM, naturally occurring radioactive material

• Latent semantic analysis, a technique in natural language processing
• Link-state advertisement, communication mechanism of the OSPF routing protocol for IP
• Local Security Authority Subsystem Service (Local Security Authority), the centre of the Windows NT security subsystem (lsass.exe)
• License and Services Agreement

• Lighting & Sound America, an entertainment technology magazine published by PLASA Media Inc
• Linseed Sunflower Almond, a health food that is a ground mixture of these three seeds.
• Limited symptom attack, a milder form of panic attack, with fewer than four panic-related symptoms
• Life-saving appliance, the multitude of devices designed for saving lifes typically found on a ship. Ranging from e.g. rescue boat to SART

• All pages with titles beginning with LSA
• All pages with titles beginning with lsa
• All pages with titles containing Lsa
• ISA (disambiguation)
• 1 SA Infantry Battalion (1st South African)
• 1Sa. (First Samuel)