| Abbreviation | Definition |
|---|---|
| RDL | Radio Design Labs |
| RDL | Refrigeration Distributors Ltd |
| RDL | Rheumatology Diagnostics Laboratory |
| RDL | Russo, Darnell, and Lodato LLP |
| RDM | Reservation Data Maintenance |
| RDMC | Research Development Manufacturing Corporation |
| RDN | RadioDailyNews.com |
| RDR | Revision of Depreciation Rate |
| RDR | Ritual Document Release |
| RDS | Red Dragon Skateboarding |
| RDSI | Rick Darche Sales Inc |
| RDSI | Roberts Disposal Services Inc |
| RDSI | Rurbanc Data Services Inc |
| RDSL | Regitech Data Systems Ltd |
| RDSL | Regitech Data Systems, Ltd. |
| RDSL | Responsive Database Services Ltd |
| RDT | Red Drum Tackle, Buxton, NC |
| RDT | Remote Diagnostic Technologies, LTD |
| RDTD | Reciprocating Drive Train Division |
| RDU | Reptiles Down Under |