The Glatt Valley (German: Glattal or Glatttal) is a region and a river valley in the canton of Zürich in Switzerland.
The River Glatt is a tributary of the River Rhine in the Zürcher Unterland area of the Canton of Zurich. It is 38.5 km (23.9 mi) long and flows out from the Greifensee thru its river valley, discharging into the Rhine by Rheinsfelden.
The Region Glatttal comprises, among other communities in the districts of Uster, Dielsdorf and Bülach, the suburban cities and municipalities of Bassersdorf, Bülach, Dietlikon, Dübendorf, Fällanden, Glattfelden, Höri, Kloten, Oberglatt, Opfikon-Glattbrugg, Rümlang, Schwerzenbach, Wallisellen and Wangen-Brüttisellen. In addition, the districts 11 and 12 (so-called Zürich-Nord) of the city of Zürich, consisting of the quarters of Affoltern, Oerlikon and Seebach respectively Hirzenbach, Saatlen and Schwamendingen Mitte, are located in the Glattal.