Grapsus albolineatus is a species of decapod crustacean in the family Grapsidae, native to the Indo-Pacific.

[1] Its carapace, or upper shell, is flat, circular, and rough with arched lateral margins, and may be up to 37 mm in length.

[2][3] This includes the waters of the Red Sea, the Gulf of Aqaba, India, Indonesia, Pakistan, Japan, Australia, and the tropical islands of the Pacific Ocean (such as Hawaii).

[4] The species consumes a mostly herbivorous diet but also takes small crustaceans and fish.

[5] Like in most other true crabs, light and temperature are the main environmental factors that determine reproductive activity.