Saint-Philbert-de-Grand-Lieu (French pronunciation: [sɛ̃ filbɛʁ də ɡʁɑ̃ ljø]; Breton: Sant-Filberzh-Deaz) is a commune in the Loire-Atlantique department in western France.

[3] It is about 400 km southwest of Paris, via Chartres, Le Mans, Angers, and Nantes.

The town is twinned with the Welsh suburb of Radyr in Cardiff, Wales's Capital.

Vicomte Bertrand Jochaud du Plessix, a lieutenant in the Free French Forces, reposes in the local cemetery.

He died along with three comrades on 30 June 1940 when they were shot down by the Spanish while attempting to land their aircraft in Gibraltar.