Martadoris amakusana is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Polyceridae.

[2] It was originally placed in Tambja before being re-assigned to the new genus Martadoris in 2017.

[3] This species was described from Tomioka, Amakusa, Japan.

It has been reported from Bali, Indonesia.

[4]