| R & D | Research & Development |
| RA | Risk assessment |
| RBPs | Restrictive business practices |
| REI | Regional economic integration |
| REIO | Regional Economic Integration Organization |
| RHQ | Regional Headquarters |
| RIA | Regional integration arrangement |
| ROOs | Rules of origin |
| RTA | Regional trade agreement |
| RTAA | Reciprocal Trade Agreements Act (United States) |