Grand-Champ (French pronunciation: [ɡʁɑ̃ ʃɑ̃]; Breton: Gregam) is a commune in the Morbihan department of Brittany in north-western France.

[3] Inhabitants of Grand-Champ are called Grégamistes in French.

Grand-Champ counted 5,404 inhabitants in 2017, an increase of 14% compared to 2007.

The town is situated 15 kilometres northwest of Vannes.

In 2008 7.77% of children attended bilingual schools in primary education.