Echinorhynchida, from Ancient Greek ἐχῖνος (ekhînos), meaning "hedgehog", and ῥύγχος (rhúnkhos), meaning "snout", is an order of parasitic worms in the phylum Acanthocephala. It contains 13 known families:

• Arhythmacanthidae Yamaguti, 1935
• Cavisomidae Meyer, 1932
• Diplosentidae Tubangui and Masiluñgan, 1937
• Echinorhynchidae Cobbold, 1876
• Fessisentidae Van Cleave, 1931
• Gymnorhadinorhynchidae Braicovich, Lanfranchi, Farber, Marvaldi, Luque and Timi, 2014
• Heteracanthocephalidae Petrochenko, 1956
• Illiosentidae Golvan, 1960
• Isthmosacanthidae Smales, 2012
• Pomphorhynchidae Yamaguti, 1939
• Rhadinorhynchidae Lühe, 1912
• Sauracanthorhynchidae Bursey, Goldberg and Kraus, 2007
• Transvenidae Pichelin and Cribb, 2001

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