RETT
| Acronym | Definition |
|---|---|
| RETT | Real Estate Transfer Tax |
| RETT | Renewable Energy Task Team (Ontario Waterpower Association; Canada) |
| RETT | Roll End Tray with Tuck Top (packaging) |
| RETT | Radionuclide Esophageal Transit Test |
| RETT | Regional Education Technology Team (Namibia) |