| Acronym | Definition |
|---|
| IDR | Issuer Default Rating (financial risk) |
| IDR | Inter-Domain Routing (IETF) |
| IDR | Indonesia Rupiah (Currency Unit, ISO) |
| idR | In Der Regel (German: Regulary) |
| IDR | I Don't Remember |
| IDR | Information Document Request |
| IDR | Instituto de Desenvolvimento Regional (Portuguese: Institute for Regional Development; Portugal) |
| IDR | Intelligent Disaster Recovery |
| IDR | Informal Dispute Resolution (law) |
| IDR | International Depository Receipt |
| IDR | Interval Data Recorder |
| IDR | I Don't Recall |
| IDR | Intermediate Data Rate |
| IDR | Intermediate Data Rate (Sprint) |
| IDR | Increased Digital Resolution (audio software; Waves Audio Ltd.) |
| IDR | Incidence Density Ratio |
| IDR | Interim Design Review |
| IDR | Initial Design Review |
| IDR | Infiltrate, Destroy, Rebuild (CKY album) |
| IDR | Instantaneous Decoding Refresh (digital TV) |
| IDR | Induced Dimension Reduction (mathematics) |
| IDR | Institute of Dental Research |
| IDR | Incremental Design Review |
| IDR | Incentive Distribution Right |
| IDR | Industrial Development Revenue Bond |
| IDR | Identification Record |
| IDR | International Development Registry (UK) |
| IDR | Intermediate Design Review |
| IDR | Input Data Request |
| IDR | Integrated Diagnostic Reconfiguration (electrical engineering) |
| IDR | Industrial Design Regulations |
| IDR | Inspection Discrepancy Report |
| IDR | Installation Design Review |
| IDR | Infantry Drill Regulation |
| IDR | Informal Design Review |
| IDR | Intelsat Data Rate |
| IDR | Ischemia-Driven Revascularization |
| IDR | Instrument Delivery Review |
| IDR | Instrument Design Review |
| IDR | Indicative Data Record |
| IDR | Incident Detail Record (Hekimian) |
| IDR | Indicative Data Report |
| IDR | Internal Deviation Request |
| IDR | Internet Data Records |
| IDR | Inherent Design Reliability |
| IDR | Instinctive Drowning Response |
| IDR | Internet Direct Response, LLC (Colleyville, TX) |
| IDR | Isolated Disc Resorption |
| IDR | Inside Dimension Ratio (pipe and tubing specification; ratio of inside diameter to wall thickness) |
| IDR | Intradermic Reaction |
| IDR | Information Difference Report |
| IDR | Inspection/Deficiency Report |
| IDR | Intertask Data Re-Distribution |
| IDR | Interface Design Requirement |
| IDR | Impact Distribution Resources, Inc (Toronto, ON, Canada) |
| IDR | Innovation Design & Research (UK) |
| IDR | Interfaith Disaster Resources (Gulf Breeze, FL) |
| IDR | Institute for Development Research, Inc. (Boston, MA) |
| IDR | Interest, Dividend, or Net Rental Income (US Census household income source) |
| IDR | In-Depth Review (various locations) |
| IDR | Institutional Digital Repository (various locations) |
| IDR | Interdisciplinary Research |
| IDR | Inhibidor Directo de la Renina (Spanish: Direct Renin Inhibitor) |