YD, Y.D., or Yd may refer to:
- YD, the ISO 3166-1 two-letter code for South Yemen
- Yd., an abbreviation for the unit of length Yard
- Square yard (Yd²)
- Cubic yard (Yd³)
- Nissan YD engine
- USS YD-43, later name for USS Captain Dud (ID-3507)
- Yarmouth–Dennis Red Sox, or Y-D Red Sox
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