| Acronym | Definition |
|---|
| TnA | Total Nonstop Action (wrestling alliance) |
| TnA | Tamil National Alliance (Sri Lanka) |
| TnA | The New Age |
| TnA | Training Needs Analysis |
| TnA | Training Needs Assessment (various organizations) |
| TnA | The National Archives (UK) |
| TnA | Texas Nurses Association |
| TnA | To No Avail |
| TnA | Threose Nucleic Acid (polymer) |
| TnA | Taskbar Notification Application |
| TnA | Trigeminal Neuralgia Association |
| TnA | Temporarily Not Available |
| TnA | The New Alhambra (sports venue; Philadelphia, PA) |
| TnA | Transitional National Assembly (Iraq) |
| TnA | Tennessee Nurses Association |
| TnA | Technology Needs Assessment (UN) |
| TnA | Total Net Assets |
| TnA | Thailand News Agency |
| TnA | Thermal Neutron Analysis |
| TnA | Transport Network Address |
| TnA | Trade Negotiations and Agreements (Canada) |
| TnA | Technologies Net Alliance (Pakistan) |
| TnA | Trans Asia Airways |
| TnA | Total Nutrient Admixture |
| TnA | Tropical North Atlantic (oceanic temperature index) |
| TnA | Thermal Neutron Activation |
| TnA | Texas Numismatic Association |
| TnA | Toyo Tire North America (White, GA) |
| TnA | Transport Network Assigned (computing) |
| TnA | Télévision Numérique Alternative (French: Digital TV Alternative; TV channel) |
| TnA | The National Acrobat (band) |
| TnA | Talula National Athletics (Aritzia clothing brand) |
| TnA | Trinity Nuclear Abolition |
| TnA | Transaction Negotiation Authority (banking; Australia) |
| TnA | Tashi Namgyal Academy (India) |
| TnA | Together and Always |
| TnA | Thales North America |
| TnA | Total Nail Avulsion |
| TnA | Tubular Sodium Reabsorption |
| TnA | Then, Now, Always |
| TnA | Telephone Network Analyzer (Agilent) |
| TnA | Tires & Asphalt (hot rod club) |
| TnA | The Nut Association |
| TnA | Transient Neurologic Attack |
| TnA | Telephone Number Administration |
| TnA | Toyota North America, Inc. |