Glatt may refer to:
- Glatt (Rhine), a river in the canton of Zürich, Switzerland
- Glatt (Thur), a river in the canton of St. Gall, Switzerland
- Stadtbahn Glattal, a modern rapid-transit system in the canton of Zürich
- Glatt Valley, the river valley of the river Glatt and a region in the canton of Zürich in Switzerland
- Glatt kosher, a special requirement of kosher food adhered to by Orthodox Jews. Those who describe themselves as keeping "Glatt Kosher" observe the laws of Kashrut very closely.
- glatt, a German and Yiddish word meaning "smooth"