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PIW may refer to:

  • Public Interest Watch, a US group that claims to fight charitable trust abuse
  • Pikwitonei Airport, the IATA code for the airport in Canada
  • PIW or Państwowy Instytut Wydawniczy (State Publishing Institute), Polish publishing house founded in 1946
  • pounds per inch width, an imperial measure
  • Person in water, a term used by water rescue team.