| Rank | Abbreviation | Meaning |
|---|
| ***** | RDDC | Recherche et développement pour la défense du Canada
| |
| **** | RDDC | Royal Danish Defence College
| |
| **** | RDDC | Remote Drug Delivery Capsule
| |
| **** | RDDC | Rapid Development and Deployment Committee
| |
| **** | RDDC | Rochester Downtown Development Corporation
| |
| **** | RDDC | Rural District Development Committee
| |
| *** | RDDC | Richmond District Democratic Club
| |
| *** | RDDC | Rebecca Davis Dance Company
| |
| *** | RDDC | Rainbow Designs Denver Customi
| |
| *** | RDDC | Radar Data Distribution Controller
| |
| ** | RDDC | Rack Drawer Delivery Cart
| |
| * | RDDC | Reddy ICE (OTC Bulletin Board [OTCBB])
| |
| * | RDDC | Ryan Dobry Diabetes Charity
| |