YD, or Yd may refer to:
Yard (yd), a unit of length
Nissan YD engine, an automobile engine
Yarmouth–Dennis Red Sox, or Y-D Red Sox, a collegiate summer baseball team based in South Yarmouth, Massachusetts
Younger Dryas, a geological period from c. 12,900 to c. 11,700 calendar years ago
South Yemen (ISO 3166-1 code YD)
A US Navy hull classification symbol: Floating derrick (YD)
YD - Young Diem / Early Day
Yd. (retailer), an Australia and New Zealand clothing retail chain
