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

This disambiguation page lists articles associated with the title Blood worm.
If an internal link led you here, you may wish to change the link to point directly to the intended article.