Ceyzériat (French pronunciation: [sɛzeʁja]) is a commune in the Ain department, Auvergne-Rhône-Alpes region in eastern France.

Ceyzériat station has rail connections to Bourg-en-Bresse and Oyonnax.

Hippolyte Paul Jayr, twice minister during the July Monarchy, was mayor of the commune at the end of the 19th century.

The French archaeologist and assyriologist Maurice Pézard (1876–1923) died in this commune.

The average annual rainfall is 1,032.6 mm (40.65 in) with November as the wettest month.