BYD

BYD or Byd can be

Companies
 BYD Company, an automobile and rechargeable battery manufacturer in China
 BYD Auto, an automobile manufacturer in China
 Boyd Gaming, a gaming and hospitality company (NYSE ticker symbol: BYD)

Other uses
 Barley yellow dwarf, a plant disease caused by the barley yellow dwarf virus
 Barry Docks railway station (National Rail station code), Wales
 Y Byd, a Welsh-language newspaper
 Bury Your Dead, American rock band