WDA may refer to:

Government bodies

• Waste disposal authority, a UK statutory designation

• Welsh Development Agency, Wales (1976–2006)

• Singapore Workforce Development Agency (formed 2003)

Other uses

• Woodvale Defence Association, loyalist vigilante group

• Wardair, a Canadian airline

• Web Dynpro ABAP, a web application variant

• Wii de Asobu, a Japanese series of Wii video games

• "WDA (Whole Different Animal)", 2026 song by Aespa