| Acronym | Definition |
|---|
| RDI | Recommended Daily Intake |
| RDI | Relationship Development Intervention |
| RDI | Respiratory Disturbance Index |
| RDI | Reference Daily Intake |
| RDI | Research, Development and Innovation |
| RDI | Royal Designer for Industry |
| RDI | Recherche, Développement et Innovation (French: Research, Development and Innovation; various organizations) |
| RDI | Relative Dose Intensity |
| RDI | Reseau d'Information (Radio Canada's French language news service) |
| RDI | Raw Data Interface (computing) |
| RDI | Regenerative Design Institute |
| RDI | Radar Doppler à Impulsions (French military plane radar) |
| RDI | Remote Defect Identification (Asynchronous Transfer Mode, ATM) |
| RDI | Resource Development Institute (US and Pakistan) |
| RDI | Revue de Droit Immobilier (French: Real Estate Law Journal) |
| RDI | Required Daily Intake |
| RDI | Rhône Développement Initiative (French: Rhone Development Initiative; Rhone, France) |
| RDI | Recherche Développement International (French: International Development Research) |
| RDI | Remote Debugging Interface |
| RDI | Results-Driven Incremental (methodology for project implementation and management) |
| RDI | Reclamation Drought Index (drought severity and duration) |
| RDI | Rainfall Dependent Infiltration |
| RDI | Remote Detect Indication |
| RDI | Residential Density Incentives |
| RDI | Resource Development Initiative (Children's Services Council and the United Way of Palm Beach County) |
| RDI | Ramsey Did It (JonBenet Ramsey theory) |
| RDI | Radiology & Diagnostic Imaging, PSC (Owensboro, Kentucky) |
| RDI | Range-Doppler Interferometry |
| RDI | Radiation Dynamics Incorporated |
| RDI | Retirement Disposal Instruction |
| RDI | Recherche et Développement en Informatique (French: Research and Development in Information Technology) |
| RDI | Redirection Destination Index |
| RDI | Row Digital Interconnect |
| RDI | Regional Development and Innovation |
| RDI | Report Data Interface |
| RDI | Remote Data Input |
| RDI | Reconnaissance, Detection & Identification |
| RDI | Received Differential Input |
| RDI | Recently Disembarked Individual (see FOB) |
| RDI | Report Data Interchange |
| RDI | Réalisation et Diffusion pour l'Industrie (French: Production and Distribution for Industry) |