SLA

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