Buchs SG railway station (German: Bahnhof Buchs SG) is a railway station in Buchs, in the Swiss canton of St. Gallen (abbreviated to SG). It is an intermediate stop on the Chur–Rorschach line and western terminus of the Feldkirch–Buchs line to Austria and Liechtenstein. It is served by local and long-distance trains. As the station is located just north of the crossing of the Rhine between Switzerland and Liechtenstein, long-distance trains traveling between Zürich and points east must reverse direction.

As of December 2024, the following long-distance services call at Buchs SG:

• EuroCity Transalpin: Single round-trip per day over the Chur–Rorschach and Feldkirch–Buchs lines between Zürich HB and Graz Hauptbahnhof.
• : Hourly service over the Chur–Rorschach line between Zürich HB and Chur, half-hourly service between St. Gallen and Chur.
• Railjet Express: Four round-trips per day over the Chur–Rorschach and Feldkirch–Buchs lines from Zürich HB to Wien Hauptbahnhof, Budapest Keleti, or Bratislava-Petržalka.
• Nightjet/EuroNight: Overnight trains over the Chur–Rorschach and Feldkirch–Buchs lines from Zürich HB to Graz Hauptbahnhof, Wien Hauptbahnhof, Praha hlavní nádraží, Budapest Keleti, or Zagreb Glavni kolodvor.

Buchs SG is served by the St. Gallen S-Bahn and Vorarlberg S-Bahn:

• St. Gallen S-Bahn S4: hourly service between Rapperswil and Sargans via St. Gallen.
• Vorarlberg S-Bahn S2: on weekdays, 11 trains over the Feldkirch–Buchs line to Feldkirch.

Buchs SG is, for customs purposes, a border station for passengers arriving from Austria. Customs checks may be performed in the station or on board trains by Swiss officials. Systematic passport controls were abolished when Switzerland joined the Schengen Area in 2008.

• Rail transport in Switzerland

• Media related to Buchs SG railway station at Wikimedia Commons
• Buchs SG railway station – SBB