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 2ý 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.