SIW or Siw may refer to: Substrate-integrated waveguide, a synthetic rectangular electromagnetic waveguide formed in a dielectric substrate Self-inflicted wound, the result of harming oneself siw, the ISO 639 code for the Siwai language SIW, the IATA code for Sibisa Airport SIW, the ICAO airline code for Sirio Executive SIW,-Strong independent women
People Siw Anita Andersen (born 1966), Norwegian actress and comedian Siw Malmkvist (born 1936), Swedish schlager singer and actress Siw Hughes (born 1958), Welsh actress Siw Wittgren-Ahl (born 1951), Swedish social democratic politician
See also Siwa (disambiguation) Siv (disambiguation) Siv (given name)