| Acronym | Definition |
|---|
| TSA | Transportation Security Administration (US Department of Homeland Security) |
| TSA | Tax Sheltered Annuity |
| TSA | The Salvation Army |
| TSA | Technology Student Association |
| TSA | Trichostatin A (histone deacetylase inhibitor) |
| TSA | Texas Society of Architects |
| TSA | Timber Supply Area (Canada) |
| TSA | Tourism Satellite Account |
| TSA | Time Series Analysis |
| TSA | Time Stamping Authority (electronic commerce) |
| TSA | Total Survey Area |
| TSA | Tourette Syndrome Association, Inc. |
| TSA | Taiwanese Student Association |
| TSA | Target Service Agent (Novell) |
| TSA | Tryptic Soy Agar |
| TSA | Thai Student Association |
| TSA | Turkish Student Association |
| TSA | Technical Support Alliance |
| TSA | Telecommunication Society of Australia |
| TSA | Thinking Skills Assessment |
| TSA | The Salon Association |
| TSA | Tuberous Sclerosis Alliance (formerly National Tuberous Sclerosis Association; Silver Spring, Maryland) |
| TSA | total surface area |
| TSA | Tampa Sports Authority |
| TSA | Tuberous Sclerosis Association (UK) |
| TSA | Tryptone Soya Agar |
| TSA | Total Shoulder Arthroplasty (shoulder joint surgery) |
| TSA | Technical Service Agreement |
| TSA | Temple Scott Associates (public relations and government relations firm; Canada) |
| TSA | Transaction Systems Architects, Inc |
| TSA | Transformation Story Archive |
| TSA | Time Slot Assignment |
| TSA | Texas Society of Anesthesiologists |
| TSA | Thermoelastic Stress Analysis |
| TSA | Temporary Segregated Area (aviation) |
| TSA | Transition State Analog |
| TSA | Teacher on Special Assignment |
| TSA | The Scout Association (UK) |
| TSA | Tapered Slot Antenna |
| TSA | Texas Speleological Association |
| TSA | Temporal Security Agency (gaming) |
| TSA | Taipei, Taiwan - Sung Shan (Airport Code) |
| TSA | Technikon Southern Africa |
| TSA | Theosophical Society in America |
| TSA | Transuranic Storage Area |
| TSA | Tajne Stowarzyszenie Abstynentów (Polish) |
| TSA | Tank Storage Association (UK) |
| TSA | Texas Sign Association |
| TSA | theater storage area (US DoD) |
| TSA | Tanzania Serengeti Adventure (safari operator) |
| TSA | Taxiway Safety Area |
| TSA | Troop Support Agency (Army) |
| TSA | Textile Services Association Limited (UK) |
| TSA | Technical System Audit |
| TSA | Technical Services Associates, Inc. |
| TSA | Technical Safety Appraisal |
| TSA | Tamil Student Association |
| TSA | Training Support Agent |
| TSA | Technology Safeguard Agreement |
| TSA | Täby Sändaramatörer (Swedish radio club) |
| TSA | Temperature Swing Absorption |
| TSA | Temporary Support Assistant (school districts) |
| TSA | Trans System Authority (gaming, Natural-Selection) |
| TSA | Transcortical Sensory Aphasia |
| TSA | Taxe Spécifique Additionnelle (French: Specific Additional Fee) |
| TSA | Trace Suspension Assembly (hard drive component) |
| TSA | Technical & Scientific Application, Inc (Houston, Texas) |
| TSA | The Schemmer Associates, Inc (Omaha, NE) |
| TSA | Travel Security Advisory |
| TSA | Title Says All |
| TSA | Transport Stream Analyzer (Instrument used in DTV broadcasting to ascertain the condition of the stream) |
| TSA | Temperate South America |
| TSA | Theatre Students' Association |
| TSA | target system analysis (US DoD) |
| TSA | Technical Support Area |
| TSA | Target State Architecture (Sprint) |
| TSA | Transport Services Agreement |
| TSA | Thermally Sprayed Aluminum |
| TSA | Time-Scale Analysis |
| TSA | Test Start Approval |
| TSA | Target Signature Array |
| TSA | Tolerance Stack Analysis (mechanical engineering) |
| TSA | Triple Sugar Agar |
| TSA | The Senate Arcade (Seattle, Washington band) |
| TSA | TELUS Solutions d'Affaires |
| TSA | Trainer Support Activity |
| TSA | Transmitting Subscriber Internet Address |
| TSA | Threat Situational Awareness |
| TSA | Technical Services Analyst |
| TSA | Target Software Agent(s) |
| TSA | The Securities Association Ltd. |
| TSA | Transmitter/Servo Drive/Antenna |
| TSA | Technical Support and Analysis |
| TSA | Target System Architecture |
| TSA | Tactical Situation Assessment |
| TSA | Testing Support Activity |
| TSA | Total Systems Architecture |
| TSA | Tropical and Subtropical Agriculture |
| TSA | Transmitting Subscriber Address |
| TSA | Technologie en Santé Animale |
| TSA | Transient Suppression Assembly |
| TSA | Tasa Especifica Adicional |
| TSA | Theater Storage Activities/Ammunition |
| TSA | Thermal Shield Antenna |
| TSA | Technical Security Area |
| TSA | Total Sample Area |
| TSA | Technical Support Activity/Agent |