RCD
- RC time constant
- RCD Espanyol de Barcelona
- RCD Mallorca
- Rabbit calicivirus disease
- Rally for Culture and Democracy
- Rassemblement Congolais pour la Démocratie
- Rassemblement Constitutionnel Démocratique
- Real Club Deportivo de La Coruña
- Recreational Craft Directive
- Regional Cooperation for Development
- Registered Community design
- Residual-current device
- Rochdale railway station
- Rural cluster development
- The Royal Canadian Dragoons