River crab

River crab may refer to:
 * Chinese mitten crab, Eriocheir sinensis, sometimes called the Chinese River Crab
 * Potamonautes perlatus, the Cape river crab of South Africa
 * Potamonautes reidi, Reid's river crab
 * Potamonautes sidneyi, the Natal river crab of South Africa
 * Liberonautes grandbassa, Grandbassa river crab
 * Liberonautes lugbe, Lugbe river crab
 * Liberonautes nanoides, dwarf river crab
 * Other species of freshwater crab
 * River crab (Internet slang), also often referred to as the doctrine of "Harmonious society", is a euphemism for Internet censorship in the People's Republic of China and a form of protest against such censorship