Siev

Siev or SIEV may refer to:


 * Suspected Irregular Entry Vessel, operational term used by the Australian Defence Force and Australian Coastwatch
 * Siev., taxonomic author abbreviation of Johann August Carl Sievers (1762–1795), German-born botanist
 * W.Siev., taxonomic author abbreviation of Wilhelm Sievers (1860–1921), German geologist and geographer
 * David Siev, director of the American documentary film, Bad Axe