Munditia subquadrata, common name the squared munditia, is a species of small sea snail, a marine gastropod mollusk, in the family Liotiidae.

The Tasmanian specimen attains a diameter of 9 mm.

The small, white, thickly shell has a discoid shape.

The four whorls are angular above, coronate and radiately ribbed, rounded below, and furnished with two rounded obsolete granular keels.

The umbilicus is very ample, with an elegantly dentate margin.