The Tuttlingen–Hattingen railway line, also called the Hattingen curve, is a railway line Baden-Württemberg, Germany.

It runs 8.5 kilometres (5.3 mi) from Tuttlingen to Hattingen (Baden) [de], creating a north–south line that bypasses Immendingen to the west.

The line forms part of the Gäubahn between Stuttgart and Singen (Hohentwiel).

In addition to freight traffic, the Hattingen curve hosts regular Intercity trains between Stuttgart and points south, including Singen (Hohentwiel), Konstanz, and Zürich.

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