W9 may refer to:
- A form used by the US federal government for tax purposes
- W9, a postcode district in the W postcode area (England)
- W9 (TV channel), a French television channel
- W9 (nuclear warhead)
- Air Bagan, by IATA code
- London Buses route W9
- Japanese minesweeper W-9, several ships
- The scientific designation for the Niland Geyser
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