Sinthusa natsumiae is a butterfly of the family Lycaenidae first described by Hisakazu Hayashi in 1979.

[1][2] It is endemic to the Philippines and is found on many islands.

It is very beautiful, especially on the forewing upperside of the male, where it has two brilliant blue colours.

Its forewing length is about 12–15 mm Etymology.

The specific name is dedicated to the second daughter of the author.