WD

WD may refer to:
*Band 3, a protein
*DAS Air Cargo, (IATA code "WD")
*Royal Canadian Air Force Women's Division
*Walt Disney
*Wardair, (defunct IATA code "WD")
*WD-40, a penetrating oil spray
*Weekday
*"Well done" (internet slang)
*Western Digital, a computer storage manufacturer
*White Dwarf (magazine)
*Wilts & Dorset, a southern England bus operator
*Winn Dixie
*Withdrawal
*Working directory