WD may refer to:
- codes
- the code for County Waterford, Ireland
- DAS Air Cargo IATA code
- Wardair defunct IATA code
- WD postcode area, England
- other
- Band 3, a protein
- Royal Canadian Air Force Women's Division
- Walt Disney
- War Department, a department of the United Kingdom, who stamped equipment, provisions, etc. with the letters "W.D."
- WD-40, a penetrating oil spray
- Web Dynpro
- Weekday
- "Well done" (internet slang)
- Western Digital, a computer storage manufacturer
- Western Economic Diversification Canada, a Canadian government agency
- White Dwarf, a compact star in astronomy
- White Dwarf (magazine)
- Wilts & Dorset, a southern England bus operator
- Winn Dixie
- Withdrawal
- Wikidot, a social networking service and wiki hosting service
- Working directory
- Working Draft, a stage in standardization process used by International Organization for Standardization
- Whipple's disease, a rare, systemic infectious disease caused by the bacterium Tropheryma whipplei
- Products
- Dodge Durango