RDR
- Democratic Republic of the Congo
- Durban Light Infantry
- Grand Forks Air Force Base
- National Court Reporters Association
- RNA-dependent RNA polymerase
- Radyr railway station
- Rangitata Diversion Race
- Rassemblement Démocratique pour le Rwanda
- Rassemblement des Républicains
- Rat für deutsche Rechtschreibung
- Red Dead
- Red Dead Redemption
- Red Dead Redemption 2
- Red Dead Revolver
- Reinier de Ridder
- Restrictive design rules
- Retail Distribution Review
- Rhodesian Defence Regiment
- Rhodesian Security Forces
- Ripple down rules
- Royal Deeside Railway