SIAT may refer to:

• S.I.A.T. (Sociedad Ibérica de Automóviles de Turismo), the predecessor company of the Spanish car maker SEAT (S.E.A.T., Sociedad Española de Automóviles de Turismo)

• Siebelwerke/ATG, a German aircraft manufacturer

• Sibaviatrans, a Russian airline

• N-acetyllactosaminide alpha-2,3-sialyltransferase, an enzyme

• SIAT station, metro station in Guangming District, Shenzhen, Guangdong Province, China

• SFU School of Interactive Arts and Technology, an interdisciplinary research and teaching department at Simon Fraser University (SFU)

See also

• Siat, a former municipality of Switzerland

• Siats, a genus of dinosaurs