Poncin (French pronunciation: [pɔ̃sɛ̃]) is a commune in the Ain department in eastern France.

It lies on the banks of the river Ain.

Of strategic importance during medieval times, Poncin is surrounded by city walls that are still in perfect shape despite their age.

The village was originally intended to receive the same patronage as Pérouges but the plan never reached fruition.

This Ain geographical article is a stub.