HATT
| Acronym | Definition |
|---|---|
| HATT | Help Authoring Tools and Techniques (web forum) |
| HATT | High All the Time |
| HATT | Hanung Toys and Textiles Limited (India; toy manufacturing) |
| HATT | Hands across the Trail (Appalachian Trail event) |
| HATT | Heparin-Associated Thrombocytopenia with Thrombosis (biomedicine) |
| HATT | Himpunan Alumni Timur Tengah (Indonesian: Alumni Association of the Middle East) |