| Acronym | Definition |
|---|
| GAT | Gin And Tonic |
| GAT | Gatling Gun |
| GAT | General Admission Ticket |
| GAT | Girl About Town |
| GAT | Grow a Tree (various organizations) |
| GAT | General Aviation Terminal (various locations) |
| GAT | Goldmann Applanation Tonometry |
| GAT | Global Air Traffic |
| GAT | Guidance Automation Toolkit (Microsoft Visual Studio 2005) |
| GAT | General Achievement Test (Australia) |
| GAT | Group Audio Terminal |
| GAT | Global Assessment Tool (comprehensive soldier fitness) |
| GAT | General Air Traffic |
| GAT | Ground Attack Tactics |
| GAT | Global Advanced Technology (various locations) |
| GAT | Group of Anaesthetists in Training |
| GAT | Generic Application Template |
| GAT | General Aviation Transportation |
| GAT | Guidance, Apportionment, and Targeting |
| GAT | Ground-to-Air Transmitter |
| GAT | Geek of All Trades |
| GAT | Greenwich Apparent Time |
| GAT | Gerib Assistance Technique (French: Gerib Technical Assistance) |
| GAT | Groupe des Assurances de Tunisie (Tunisian Insurance Company) |
| GAT | Groupement Airsoft Team (French: Group Airsoft Team) |
| GAT | General Any Topic (forum website) |
| GAT | Gressorial Armament Tactical (Mobilesuit Gundam gaming) |
| GAT | Government Acceptance Test |
| GAT | Guantanamo to Aruba to Trinidad (US Navy) |
| GAT | Graphical ASCII Toolkit |
| GAT | Gestion Assistée de Trésorerie (French: Allied Cash Management) |
| GAT | Goodyear Atomic Corporation |
| GAT | Global Access Table |
| GAT | Gamers Against Terrorism |
| GAT | Gate-Assisted Thyristor |
| GAT | Gratias Ago Tibi (Latin: thank you) |
| GAT | Graphics Art Team |
| GAT | Group Audio Terminal(s) (ITU-T P.300) |
| GAT | Gravity Assist Trajectory |
| GAT | General Anything Topic (general discussion forums) |
| GAT | Ground Assault Tank (Star Wars) |