List of annelid families describes the taxa relationships in the phylum Annelida, which contains more than 17,000 extant species including ragworms, earthworms, and leeches.
Class Polychaeta
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Palpata
- Sub-class Errantia
- Order Amphinomida
- Family Amphinomidae Savigny in Lamarck, 1818
- Family Euphrosinidae Williams, 1851
- Order Eunicida
- Family Dorvilleidae Chamberlin, 1919
- Family Eunicidae Berthold, 1827
- Family Hartmaniellidae Imajima, 1977
- Family Lumbrineridae Schmarda, 1861
- Family Oenonidae Kinberg, 1865
- Family Onuphidae Kinberg, 1865
- Order Phyllodocida
- Family Acoetidae Kinberg, 1856
- Family Alciopidae Ehlers, 1864
- Family Aphroditidae Malmgren, 1867
- Family Chrysopetalidae Ehlers, 1864
- Family Eulepethidae Chamberlin, 1919
- Family Glyceridae Grube, 1850
- Family Goniadidae Kinberg, 1866
- Family Hesionidae Grube, 1850
- Family Ichthyotomidae Eisig, 1906
- Family Iospilidae Bergstroem, 1914
- Family Lacydoniidae Bergstroem, 1914
- Family Lopadorrhynchidae Claparede, 1868
- Family Myzostomatidae Benham, 1896
- Family Nautiliniellidae Miura and Laubier, 1990
- Family Nephtyidae Grube, 1850
- Family Nereididae Johnston, 1865
- Family Paralacydoniidae Pettibone, 1963
- Family Pholoidae Kinberg, 1858
- Family Phyllodocidae Oersted, 1843
- Family Pilargidae Saint-Joseph, 1899
- Family Pisionidae Southern, 1914
- Family Polynoidae Malmgren, 1867
- Family Pontodoridae Bergstroem, 1914
- Family Sigalionidae Malmgren, 1867
- Family Sphaerodoridae Malmgren, 1867
- Family Syllidae Grube, 1850
- Family Tomopteridae Johnston, 1865
- Family Typhloscolecidae Uljanin, 1878
- Incertae sedis
- Family Aberrantidae Wolf, 1987
- Family Nerillidae Levinsen, 1883
- Family Spintheridae Johnston, 1865
- Canalipalpata
Scolecida
- Family Aeolosomatidae
- Family Arenicolidae
- Family Capitellidae
- Family Cossuridae
- Family Maldanidae
- Family Opheliidae
- Family Orbiniidae
- Family Paraonidae
- Family Parergodrilidae
- Family Potamodrilidae
- Family Psammodrilidae
- Family Questidae
- Family Scalibregmatidae
Echiura
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- Order Echiuroidea
- Suborder Bonelliida
- Family Bonelliidae
- Family Ikedidae
- Suborder Echiurida
- Family Echiuridae
- Family Thalassematidae
- Family Urechidae
Class Clitellata
- Order Branchiobdellida
- Subclass Hirudinea (Leech)
- Infraclass Acanthobdellidea
- Infraclass Euhirudinea
- Order Arhynchobdellida
- Suborder Erpobdelliformes
- Family Erpobdellidae Blanchard, 1894
- Family Gastrostomobdellidae Richardson, 1971
- Family Orobdellidae Nakano, Ramlah & Hikida, 2012
- Family Salifidae Johansson, 1910
- Suborder Hirudiniformes
- Family Cylicobdellidae
- Family Haemadipsidae
- Family Haemopidae
- Family Hirudinidae
- Family Semiscolecidae
- Family Xerobdellidae
- Suborder Erpobdelliformes
- Order Rhynchobdellida
- Family Glossiphoniidae
- Family Ozobranchidae (disputed)
- Family Piscicolidae
- Order Arhynchobdellida
Class Machaeridia †
- Family †Plumulitidae
- Family †Turrilepadidae
- Family †Lepidocoleidae
Subphylum Sipuncula
- Class Phascolosomatidea
- Order Aspidosiphoniformes
- Family Aspidosiphonidae
- Order Phascolosomatiformes
- Family Phascolosomatidae
- Order Aspidosiphoniformes
- Class Sipunculidea
- Order Golfingiiformes
- Family Golfingiidae
- Family Phascolionidae
- Family Themistidae
- Order Sipunculiformes
- Family Sipunculidae
- Order Golfingiiformes