La Roche-Derrien (French pronunciation: [la ʁɔʃ dɛʁjɛ̃]; Breton: Ar Roc'h-Derrien) is a former commune in the Côtes-d'Armor department of Brittany in northwestern France.

On 1 January 2019, it was merged into the new commune La Roche-Jaudy.

[2] Inhabitants of La Roche-Derrien are called rochois in French.

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