Hydrophis belcheri, commonly known as the faint-banded sea snake or Belcher's sea snake, is a venomous species of elapid sea snake. It has a timid temperament and would normally have to be subjected to severe mistreatment before biting. Usually those bitten are fishermen handling nets, although only a quarter of those bitten are envenomated since the snake rarely injects much of its venom. Because of this, and its docile nature, it is generally not regarded as very dangerous. Although not much is known about the venom of this species, its LD50 toxicity in mice has been determined to be 0.24 mg/kg when delivered intramuscularly.