| Acronym | Definition |
|---|
| LSA | Light Sport Aircraft |
| LSA | Link State Advertisements |
| LSA | Literature, Science, and the Arts (university) |
| LSA | Latent Semantic Analysis |
| LSA | Linguistic Society of America |
| LSA | Local Security Authority (Windows NT) |
| LSA | Learning Support Assistant |
| LSA | Legal Services Agency |
| LSA | Low Specific Activity |
| LSA | Law and Society Association (Amherst, MA) |
| LSA | Logistics Support Analysis |
| LSA | Link-State Algorithm |
| LSA | Life Saving Appliance(s) |
| LSA | Logistics Support Area |
| LSA | Labor Surplus Area |
| LSA | Lysergic Acid Amide (alkaloid with a chemical structure similar to LSD) |
| LSA | Local Spiritual Assembly (Institution of the Baha'i Faith) |
| LSA | Life Support Area |
| LSA | Lichen Sclerosus et Atrophicus |
| LSA | Lymphosarcoma (cancer of the lymphatic system) |
| LSA | Late Stone Age |
| LSA | Lifetime Savings Account |
| LSA | List of Sections Affected |
| LSA | Laser Surface Authentication |
| LSA | Local Service Area |
| LSA | Leukemia Society of America |
| LSA | d-Lysergic Acid Amide |
| LSA | Lead Sheet Association (UK) |
| LSA | Lubricant, Small Arms |
| LSA | La Salle Academy (Iligan City, Philippines) |
| LSA | Laser Spike Annealing (semiconductor process supported by Ultratech) |
| LSA | Lead Standardization Activity |
| LSA | Line Sharing Adapter |
| LSA | Layered Scalable Architecture |
| LSA | Launch Services Agreement |
| LSA | Linux Standards Association |
| LSA | Logic State Analyzer |
| LSA | Lilly Software Associates, Inc. |
| LSA | Lotus Solution Architecture |
| LSA | LaSalle Academy (various locations) |
| LSA | Local Security Administrator |
| LSA | Louisiana Statutes Annotated |
| LSA | Loss of Situational Awareness |
| LSA | Lutheran Student Association |
| LSA | Limited Space charge Accumulation |
| LSA | Large-Scale Array |
| LSA | Linear Servo Actuator |
| LSA | London Small Arms Company |
| LSA | Large Space Antenna |
| LSA | Least Square Approximation |
| LSA | Loyal Supporters Association |
| LSA | Lightship Sailors Association (US Coast Guard) |
| LSA | Landform-Sediment Assemblage |
| LSA | Lego Space Alliance |
| LSA | Logistics Support Agency |
| LSA | Licensed Surgical Assistant |
| LSA | Licensed Staff Agreement (State Farm Insurance) |
| LSA | Landing Ship Assault |
| LSA | Latino Students Association |
| LSA | Leventhal School of Accounting (University of Southern California) |
| LSA | Louisiana Shooting Association (Metairie, LA) |
| LSA | Liberty Search Associates, Inc. (Clearwater, FL) |
| LSA | Lebanese Society of Anesthesiologists |
| LSA | Louisville Swim Association |
| LSA | Ligno-Sulfonic Acid |
| LSA | Laura Shanks Associates (UK) |
| LSA | Lothian Surgical Audit |
| LSA | Local Search Approach |
| LSA | Limited Security Area |
| LSA | Large Sample Approximation |
| LSA | List of Code of Federal Regulations Sections Affected (manual detailing changes to the CFR) |
| LSA | Level Shift Amplifier |
| LSA | Logistics Module - Stand Alone |
| LSA | Logistic System Acquisition |
| LSA | Local Services Agreement |
| LSA | Low Solar Absorbency (paint with reflective properties in the near infrared spectrum) |
| LSA | Learning Skills Assessment |
| LSA | License of the Society of Apothecaries |
| LSA | Lightwave Signal Analyzer |
| LSA | Line Source Antenna |
| LSA | Logistics Systems Analysis/Analyst |
| LSA | Lemming Society of America |
| LSA | Low Speed Auxiliary |
| LSA | Logistics Systems Architects |
| LSA | Logistics Service Agreement |
| LSA | Low Source Alignment |
| LSA | Labor Service Agency |
| LSA | Logistical Support Agency |
| LSA | Lubricant, Semifluid, Automatic weapons |
| LSA | Line Shaft Assembly |
| LSA | Lower Surficial Aquifer (Florida water source) |
| LSA | Leading Supply Assistant (UK naval rank or rating level) |
| LSA | Licensed Space Arrangement |
| LSA | Linear Separation Assembly (US NASA) |
| LSA | Living Spring Academy (Iligan City, Phillipines) |
| LSA | Linux System Administrator (computer job) |
| LSA | Life Science Angels (investing) |
| LSA | Legal Sector Alliance (climate change) |
| LSA | Lead State Agency |
| LSA | Liquid Solar Array (Sunengy Pty. Ltd.; Australia) |