Fronsac (French pronunciation: [fʁɔ̃sak]; Occitan: Fronçac) is a commune in the Gironde department in the Nouvelle-Aquitaine region in southwestern France.

It was the site of the Gauls' market, the Romans erected an altar there, and Charlemagne built a fortified camp on the mound ("Franciacus") in 769, where the Basques led by duke Lupo came to pledge allegiance to the Frankish King after Aquitaine's submission.

[3] The Marechal of Richelieu had a "folly" built there, to an extravagant architectural design, where he held courtly entertainments.

As word spread of these events, the renown of Fronsac's wines was carried with it to the Court of Versailles.

Situated on the right bank of the Gironde River, the commune is an appellation in itself, as well as a sub-appellation, Canon-Fronsac AOC.