Munditia manawatawhia is a minute sea snail, a marine gastropod mollusc in the family Liotiidae.
The height of the smooth shell attains 0.8 mm, its diameter 1.5 mm. This very small, white shell has a discoidal shape and wide umbilicus. It contains 2½ rapidly increasing whorls. The aperture is circular.
This marine species is endemic to New Zealand. It is known from the Three Kings Islands, New Zealand.