| Schwechat | |
| Map: | Schwechat.png |
| Subdivision Type1: | Country |
| Subdivision Name1: | Austria |
| Subdivision Type2: | State |
| Subdivision Name2: | Lower Austria |
| Subdivision Type4: | Counties |
| Subdivision Type5: | Towns |
| Length: | 62km (39miles) |
| Source1 Location: | Schöpfl, Vienna Woods |
| Mouth: | Danube |
| Mouth Location: | near Schwechat |
| Mouth Coordinates: | 48.1379°N 16.5603°W |
| Tributaries Left: | ,,, |
| Tributaries Right: | Triesting, Kalter Gang |
The Schwechat (pronounced as /de/) is a river in Lower Austria. Its drainage basin is .[1]
The source is near the Schöpfl (893 m) in the Vienna Woods. The source streams are the Riesenbach, Lammeraubach, Agsbach, Hainbach and the Großkrottenbach, which merge at Klausen-Leopoldsdorf to form the Schwechat. It flows through the small town of Alland, through the Helenental to Baden, and through the Vienna Basin to Schwechat, where the river flows into in the Danube.
The Helenental is the Schwechat valley from Mayerling to Baden, named for the parish church of St Helena (German: Pfarrkirche St Helena), about 2miles from the town center of Baden. Originally gothic, it has since been replaced by a baroque structure.