Saint-Didier-sur-Chalaronne (French pronunciation: [sɛ̃ didje syʁ ʃalaʁɔn], literally Saint-Didier on Chalaronne) is a commune in the Ain department in eastern France.

The Chalaronne flows westward through the southern part of the commune, then flows into the Saône, which forms part of the commune's southwestern border.

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