Blood worm

Blood worm or bloodworm is an ambiguous term and can refer to:


 * Larvae of a non-biting midge (family Chironomidae) containing hemoglobin
 * Glycera (annelid), a polychaete often used for fishing bait
 * Species of the Polychaeta subclass Scolecida
 * Angiostrongylus cantonensis, a parasitic nematode that causes Angiostrongyliasis and the most common cause of eosinophilic meningitis
 * Eisenia fetida, an earthworm adapted to decaying organic material
 * Lumbriculus variegatus, more commonly called blackworm
 * Strongylus vulgaris, a common horse parasite