Miamira sinuata is a species of colorful dorid nudibranch, a sea slug, a shell-less marine gastropod mollusk in the family Chromodorididae.

[2] This species is reported from the central Indo-Pacific including the Philippines, Taiwan, Indonesia and eastern Australia.

[3] Miamira sinuata has a mottled appearance with a bright green to purplish brown reticulation.

The whole body is covered with low rounded yellow tubercles and there are a few aquamarine spots placed at the sides of the mantle in most individuals.

The gills and the rhinophores are translucent greenish or brownish with scattered white spots.