The common term sand crab can refer to various species of crustacean:
Crustaceans of the superfamily Hippoidea, often known as mole crabs Hippidae, a family within Hippoidea Emerita (crustacean), a genus within Hippidae Crabs of the subfamily Ocypodidae, also commonly known as ghost crabs Corystes cassivelaunus, found around the North Atlantic, Mediterranean Sea and North Sea Ovalipes australiensis, found on Australia's south coast Portunus pelagicus, an Indo-Pacific swimming crab