The canton of Treffort-Cuisiat is a former administrative division in eastern France. It was disbanded following the French canton reorganisation which came into effect in March 2015. It consisted of 9 communes, which joined the new canton of Saint-Étienne-du-Bois in 2015. It had 8,281 inhabitants (2012).

The canton comprised 9 communes:

Historical population of Canton of Treffort-Cuisiat
(Source: INSEE)

Year	1962	1968	1975	1982	1990	1999
Population	4 326	4 664	4 525	5 728	6 274	6 815
From the year 1962 on: No double counting—residents of multiple communes (e.g. students and military personnel) are counted only once.

• Cantons of the Ain department

46°16′20″N 5°22′12″E / 46.27222°N 5.37000°E / 46.27222; 5.37000