Thalassodes immissaria is a moth of the family Geometridae first described by Francis Walker in 1861.

It is found in the Oriental tropics of China, India, Myanmar, Sri Lanka,[1] Hong Kong, Japan,[2] Borneo, Vietnam, Sumatra, Sulawesi and the Ryukyu Islands.

The populations in Ryukyu were often classified as a subspecies - Thalassodes immissaria intaminata Inoue, 1971.

[3] However, in 2005 this subspecies was upgraded to a distinct species, which can be distinguished from immissaria by careful examination of the male genitalia.

[6] The caterpillar feeds on Mangifera indica, Lagerstroemia, Nephelium, Eucalyptus camaldulensis, Dimocarpus longan and Litchi chinensis.