SLA may refer to: Geography Martín Miguel de Güemes International Airport, Salta, Argentina, IATA code Science and engineering Sealed lead-acid battery Second-language acquisition Short long arms suspension, in vehicles Soluble liver antigen or O-phosphoseryl-tRNA(Sec) selenium transferase, an enzyme Spacecraft Lunar Module Adapter, part of Apollo/Saturn S-IVB Specific leaf area, ratio of leaf area to dry mass on a plant Stereo lithographic apparatus, a 3D printing technology Organizations Science Leadership Academy, Philadelphia, Pennsylvania, US School Library Association Sindhi Language Authority, Pakistan Sindhudesh Liberation Army, a separatist organisation in Pakistan Singapore Land Authority South Lebanon Army, Lebanese Civil War militia Special Libraries Association, for librarians Sri Lanka Army State Liquor Authority, New York, US Sudan Liberation Movement/Army, a rebel group in Darfur Symbionese Liberation Army, 1970s US radical group Other Service-level agreement SLA Industries, a role-playing game File format used by Scribus software Softwood Lumber Agreement between US and Canada