Bâgé-le-Châtel (French pronunciation: [bɑʒe lə ʃɑtɛl]) is a commune in the Ain department in eastern France.

The name of Bâgé-le-Châtel comes from a Gallo-Roman villa belonging to a certain Balgiasius.

In the Middle Ages, three parishes were formed on the territory of the Seigneurs de Bâgé: Bâgé-le-Châtel around the chateau, Saint-André where the church was built, and Bâgé-la-Ville, the largest town.

Bourg (today Bourg-en-Bresse), a fortified bastion with 3400 inhabitants, became the capital of Bresse.

Bâgé remained a village, whereas Bourg expanded beyond its walls to become the city of today.