The expression Chur S-Bahn (German: S-Bahn Chur) is used to describe two S-Bahn-style regional rail services focused upon Chur, the capital of the canton of Graubünden, Switzerland. Both of these S-Bahn services run on metre gauge lines, and are operated by the Rhaetian Railway, which also runs the line from Chur to Arosa in similar fashion.

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Chur S-Bahn
A Chur S-Bahn composition at Thusis, 2007.
Overview
Locale	Chur, Switzerland
Transit type	S-Bahn
Number of lines	2
Headquarters	Chur
Website	Rhaetian Railway (in English)
Technical
Track gauge	1,000 mm (3 ft 3+3⁄8 in)
Electrification	11 kV 16,7 Hz ~
Chur S-Bahn

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Upon the 2005 timetable change, the Chur – Landquart and Thusis – Chur regional lines on the Landquart–Thusis railway were converted into S-Bahn lines. They were originally designated S8 and S9, respectively. The former line was also extended at both ends, to Rhäzüns and Schiers. Since 2009, the two lines have been designated S1 and S2, respectively.

The following lines are the ones currently in service:^[1]

• S 1 Rhäzüns – Reichenau-Tamins – Chur West – Chur – Landquart – Schiers
• S 2 Thusis – Rhäzüns – Reichenau-Tamins – Chur
• R Chur – Arosa

Each of the S-Bahn lines operates at hourly intervals. Where they overlap, between Rhäzüns and Chur, the service intervals are 20 minutes / 40 minutes.

There are proposals to add to the Chur S-Bahn network the Ziegelbrücke – Sargans – Landquart – Chur regional line, which is operated by the SBB-CFF-FFS, and also to shorten its service intervals to a train every thirty minutes. Additionally, this line is proposed to be extended to Ems Werk via SBB-CFF-FFS / RhB dual gauge track.

• Bernina Express
• Glacier Express