| Image Alt: | Map depicting the route of the Laaer Ostbahn |
| Start: | Wien Hauptbahnhof |
| Linelength Km: | 82.6 |
| Map State: | collapsed |
The Laaer Ostbahn is a railway line in Lower Austria. It runs from Wien Hauptbahnhof to, on the Czech–Austrian border. The line formerly continued to Brno. Austrian Federal Railways (ÖBB) owns and operates the line.
The Laaer Ostbahn begins at Wien Hauptbahnhof in Vienna and then turns north, splitting from the Eastern Railway and crossing the Donaukanal and Danube. At, the Marchegger Ostbahn splits to the east while the Laaer Ostbahn continues north. Near, the Laaer Ostbahn crosses and interchanges with the North railway. Continuing north, the line terminates at, on the border with the Czech Republic. The to Hevlín and Brno was severed in 1945, as a result of the Second World War.[1]
The southern end of the Laaer Ostbahn hosts the and of the Vienna S-Bahn, as well as Regional-Express and Regionalzug services, all of which leave the line at and use the Marchegger Ostbahn for, Marchegg, or .[2]
On the northern end, Regional-Express and trains join the line at Gerasdorf, coming off the North railway. Services operate to Laa an der Thaya.[3] There are no local services between Wien Erzherzog-Karl-Straße and Gerasdorf; some long-distance services such the EuroCity between Vienna and Katowice use that portion of the line to reach Břeclav.[4]