| Acronym | Definition |
|---|
| SMDI | Steel Market Development Institute (est. 2008) |
| SMDI | Simplified Message Desk Interface |
| SMDI | Simplified Message Desk Interface (telephone network service, customer interface specification) |
| SMDI | Society for Muscular Dystrophy Information International (Bridgewater, Nova Scotia, Canada) |
| SMDI | Synectics for Management Decisions, Inc. (Arlington, VA) |
| SMDI | Station Message Desk Interface |
| SMDI | SCSI Musical Data Interchange |
| SMDI | Storage Module Disk Interconnect |
| SMDI | Student Microfinance and Development Initiative (UK; est. 2008) |
| SMDI | Scotia Mcleod Direct Investing (Canada) |