Saint-Guyomard (French pronunciation: [sɛ̃ ɡɥijɔmaʁ]; Breton: Sant-Gwioñvarc'h) is a commune in the Morbihan department of Brittany in north-western France.

[3] Inhabitants of Saint-Guyomard are called in French Guyomardais.

The official population in 2019 was 1,389.

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