Pont-d'Ain (; Arpitan: Pont d'En, also Lo Pont d'En; "Bridge of Ain") is a commune in the Ain department in the Auvergne-Rhône-Alpes region in Eastern France.
It is best known for its Château de Pont-d'Ain (Castle of Pont-d'Ain) on the right bank of the Ain River, a monument historique since 2004. It was built in the 14th century, before it was refurbished and reorganised a number of times.
Pont-d'Ain is served by Pont-d'Ain station on the MâconâÂÂAmbérieu railway, operated by the SNCF.