MD3, MD 3 or MD-3 can mean:
- Dätwyler MD-3 Swiss Trainer, a Swiss light aircraft
- Flyitalia MD3 Rider, an Italian ultralight aircraft
- Maryland's 3rd congressional district, a United States electoral region
- Maryland Route 3, a United States highway
- MD3 (file format)
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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