| HAT | Handling and Assembly Technology 
| Others |
| HAT | Happy Active Town
| Others |
| HAT | Harbour Acceptance Test
| Others |
| HAT | Hardware Address Translation
| Others |
| HAT | Hardware attached on top
| Others |
| HAT | Hatchback
| Others |
| HAT | Head Aimed Television
| Others |
| HAT | Heathlands, Queensland, Australia
| Others |
| HAT | Height Above Touchdown
| Others |
| HAT | Heparin Associated Thrombocytopenia
| Others |
| HAT | Hepatic Artery Thrombosis
| Others |
| HAT | Here And There
| Others |
| HAT | Highest Astronomical Tide
| Others |
| HAT | Hinte Anderson Trail
| Others |
| HAT | Histone AcetylTransferase
| Others |
| HAT | Historic Assen Trophy
| Others |
| HAT | History Aptitude Test
| Others |
| HAT | History of Advertising Trust
| Others |
| HAT | Holo Active Touch
| Others |
| HAT | Homeopathy Action Team
| Others |
| HAT | Homework And Teachers
| Others |
| HAT | Homework, Attendance, and Tardies
| Others |
| HAT | Honda Auto Terrace
| Others |
| HAT | Honda Automobile Thailand
| Others |
| HAT | HOORA (Hierarchical Object-Oriented Requirements Analysis) Analysis Tool
| Others |
| HAT | Housing Action Trust
| Others |
| HAT | How About That
| Others |
| HAT | Hub of All Things
| Others |
| HAT | Hulcher Auto Technik
| Others |
| HAT | Human African Trypanosomiasis
| Others |
| HAT | Hypoxanthine, Aminopterin, Thymidine
| Others |
| HAT | Hypoxanthine-aminopterin-thymidine medium
| Others |
| HAT | Hyundai Avto Trade
| Others |