RCD may stand for:
- Residual-current device in electrical engineering, a 'safety switch' style mechanism to prevent electrocution
- Radiocarbon dating, a scientific method of dating once-living matter
- Rassemblement Congolais pour la Démocratie, a rebel group in the Democratic Republic of the Congo
- The Royal Canadian Dragoons, a Canadian Forces armoured regiment
- Rassemblement Constitutionnel Démocratique, a political party in Tunisia
- Rye Country Day School in New York, United States
- Rally for Culture and Democracy, a political party in Algeria
- Rabbit calicivirus, a virus that causes Rabbit Haemorrhagic Disease
- Regional Cooperation for Development, a multi governmental organization of Iran, Pakistan and Turkey
- Spanish Real Club Deportivo or Catalan: Reial Club Deportiu, various football clubs:
- RCD Mallorca
- RCD Espanyol de Barcelona
- RC Deportivo de La Coruña
- Rural Cluster Developments, a form of subdivision of residential housing
- Registered Community Design, an industrial design right that covers the European Community