| Acronym | Definition |
|---|
| ARDD➣Alberta Renewable Diesel Demonstration (Canada) |
| ARDD➣Acadiana Regional Development District (Louisiana) |
| ARDD➣Agriculture and Rural Development Department (various locations) |
| ARDD➣Animal Resources Development Department (India) |
| ARDD➣Automatic Roller Detent Decoupler (aviation; helicopters) |
| ARDD➣Auxiliary Repair Dry Dock |