PIW

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 teams in the case of a Man overboard.

PIW