Peillac (French pronunciation: [pɛjak] ⓘ; Breton: Paolieg; Gallo: Peilla) is a commune in the east of Morbihan department of Brittany in north-western France.

[3] The canal de Nantes à Brest forms all of the commune's northern border; the river Arz forms all of its southern border.

Inhabitants of Peillac are called in French Peillacois.

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