WDD or Wdd may refer to:

• World Diabetes Day, the global awareness campaign
• When Dream and Day Unite, the debut studio album by Dream Theater
• wdd, the ISO 639-3 code for Wanzi language
• Walter Donald Douglas, an American business executive
• Woodside station (LIRR), the station code WDD
• Widdrington railway station, the station code WDD
• Weakly diagonally dominant
• Western Development Division

This disambiguation page lists articles associated with the title WDD.
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