Calcinus laevimanus, the left-handed hermit crab, is a species of hermit crab in the genus Calcinus found in the Indo-West Pacific region, the type locality being Hawaii.

The propodus (penultimate joint) is smooth and shiny, the finger and thumb having spoon-shaped, calcified tips.

Its range extends from East Africa, Madagascar and the Comores, through Indonesia, the Philippines, Australia and Papua New Guinea to Hawaii, and includes many of the western Pacific archipelagoes.

[2] This is an aggressive hermit crab species which is prepared to fight for empty shells or other resources.

The size and brightness of the white patch on the left chela seems to be a status symbol and helps its bearer in agonistic interactions.