Kumamoto dialect (熊本弁, Kumamoto-ben) is a dialect of the Japanese language spoken in Kumamoto Prefecture. It belongs to the Hichiku group, and shares similarities with other nearby dialects in Kyushu.

The I adjective in Standard Japanese becomes "か" (ka) in Kumamoto dialect:

うまい (umai, "tasty") > うまか (umaka)

よい (yoi, "good") > よか (yoka)

This feature is found in other Kyushu dialects. The negative conjugation "ない" (nai) also becomes "なか" (naka).

Unlike Standard Japanese, Kumamoto dialect is described as "accentless", meaning it has no fixed tonal pattern.

Kumamoto dialect has a different set of Ko-so-a-do words:

これ (kore, "this") > こっ (ko')