Théhillac (French pronunciation: [te.ijak] ⓘ; Breton: Tehelieg) is a commune in the Morbihan department of Brittany in north-western France.

[3] Inhabitants of Théhillac are called in French Théhillacois.

The population was 596 as of 2017, an increase of 16% compared with 1999.

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