Saint-Marcellin (French pronunciation: [sɛ̃ maʁsəlɛ̃] ⓘ) is a commune in the Isère department, in southeastern France,[3] 51 km from Grenoble.

The town is served by a railway station, on the line from Valence to Grenoble.

Saint-Marcellin is twinned with:

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