The canton of Montmarault is a former administrative division in central France. It was disbanded following the French canton reorganisation which came into effect in March 2015. It had 7,991 inhabitants (2012).

The canton comprised the following communes:

Historical population of Canton of Montmarault
(Source: INSEE)

Year	1962	1968	1975	1982	1990	1999
Population	8 875	9 477	8 622	8 050	8 088	8 074
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 Allier department

46°19′06″N 2°57′20″E / 46.31833°N 2.95556°E / 46.31833; 2.95556