| Abbreviation | Definition |
|---|---|
| RDEO | Renew Delta - Electoral Organization |
| RDO | Regular Democratic Organization |
| RDP | Reformer's Dominion Party |
| RDZ | Renewal Democrats of Zimbabwe |
| RE | Renovación Español |
| RED | Rural Economic Development |
| REF | Reform Party |
| REP | Republicans For Environmental Protection |
| REPI | Recherche et Enseignement en Politique Internationale |
| RGA | Republican Governors Association |
| RHC | Republican Hindu Coalition |
| RIC | Radical Independence Campaign |
| RIMP | Red de Itinerarios para Mercancías Peligrosas |
| RINO | Republican In Name Only |
| RIPE | Review of International Political Economy |
| RIPG | Research Institute for Politics and Government |
| RIPS | Research on Individuals Politics and Society |
| RIRA | Rhode Island Republican Assembly |
| RISF | Regimento Interno do Senado Federal |
| RJC | Republican Jewish Coalition |