Treffort-Cuisiat (French pronunciation: [tʁefɔʁ kɥizja]) is a former commune in the Ain department in eastern France.

It was created in 1972 by the merger of two former communes: Treffort and Cuisiat.

[3] The Sevron formed most of the commune's southwestern border.

Cuisiat is home to the Revermont museum in the old school house.

This Ain geographical article is a stub.