| Acronym | Definition |
|---|
| RDD | Redding (Amtrak station code; Redding, CA) |
| RDD | RDF (Resource Description Framework) Declarative Description |
| RDD | Requirements and Design Document (project process) |
| RDD | Regime Disciplinar Diferenciado (Brazilian law) |
| RDD | Random Digit Dialing |
| RDD | Resilient Distributed Dataset (Apache Spark) |
| RDD | Reliable Data Distribution |
| RDD | Radiological Dispersal Device |
| RDD | Random Digit Dial |
| RDD | Real Disk Drive |
| RDD | Relative Drawdown (foreign exchange market) |
| RDD | Radar Detector Detector |
| RDD | Radiological Dispersion Device |
| RDD | Respiratory Drug Delivery |
| RDD | Rights Data Dictionary |
| RDD | Responsibility-Driven Design |
| RDD | Radiation Dispersal Device |
| RDD | Research, Development and Demonstration |
| RDD | Regression Discontinuity Design (experiment design) |
| RDD | Research and Development Directorate |
| RDD | Renault Driver Development |
| RDD | Red Dragon Disciple (Dungeons and Dragons & Neverwinter gaming) |
| RDD | Remise des Diplômes (French: Graduation Ceremony) |
| RDD | Replaceable Database Driver |
| RDD | Requirements Definition Document |
| RDD | Reliability Defect Density |
| RDD | Rational Drug Design |
| RDD | Research Data Design |
| RDD | Redding, CA, USA - Redding Municipal Airport (Airport Code) |
| RDD | Requirements Driven Development |
| RDD | Research Development Department |
| RDD | Return Data Delay |
| RDD | Reviewable Design Data (project implementation protocol; various organizations) |
| RDD | Recommended Daily Dosage |
| RDD | Rigid Disk Drive |
| RDD | Radio Direct Dial |
| RDD | Requirements Determination Division |
| RDD | Rapports de Développement Durable (French: Sustainable Development Reports; various organizations) |
| RDD | Road Development Department (Sri Lanka) |
| RDD | Requirement Definition Document |
| RDD | Royaume des Dragons (French: Dragon Realm; gaming clan) |
| RDD | Requirement Driven Design |
| RDD | Requirements Documentation Directorate |
| RDD | Required Delivery Date/Data |
| RDD | Requested Due Date (telecommunications industry) |
| RDD | Requirement Description Document |
| RDD | Required Delivery Density (fire sprinklers) |
| RDD | Rassemblement pour La Démocratie Directe (French: Rally for Direct Democracy) |
| RDD | Ruggedized Disk Drive |
| RDD | Richard's Design Drafting LLC |
| RDD | Renegade Decepticon Dissidents (gaming clan) |
| RDD | Relative Delay Deviation |
| RDD | Racial Disproportionality and Disparities |
| RDD | Redeployment Date (US DoD) |