The Japanese mitten crab (Eriocheir japonica), is a species of crab native to Korea and Japan.

It is catadromous, being usually found in freshwater and brackish environments, but moving downstream into coastal marine environments to breed.

[2] It is commonly eaten and economically important in its native range.

[3] The species is found in Japan, Korea, and the southeastern coast of Russia.

Sporadic introduced populations are also present in the United States, and a degree of introgression of the species has occurred in the invasive European populations of its close congener, the Chinese mitten crab.