The coconut crab (Birgus latro) is a species of terrestrial hermit crab, also known as the robber crab or palm thief. It is the largest land-living arthropod in the world, and is probably at the upper size limit for terrestrial animals with exoskeletons in recent times, with a weight of up to 4.1 kg (9.0 lb). It can grow to up to 1 m (3 ft 3 in) in length from leg to leg.

The large size of the coconut crab and the quality of its meat means that the coconut crab is extensively hunted and is very rare on islands with a human population. The coconut crab is eaten by Southeast Asians and Pacific Islanders and is considered a delicacy and an aphrodisiac.

The pincers of the coconut crab are powerful enough to cause noticeable pain to a human; furthermore, the coconut crab will often keep its hold for extended periods of time.