1. Subfamily Allogomtiotrematinae Yamaguti, 1958
   1. Genus Allogomtiotrema Yamaguti, 1958
   2. Genus Satyapalia Lakshminarayana & Hafeezullah, 1974
   3. Genus Assamia Gupta, 1955 accepted as Satyapalia Lakshminarayana & Hafeezullah, 1974 (unaccepted > junior homonym)
2. Subfamily Apophallinae Ciurea, 1924
   1. Genus Apophallus Lühe, 1909
   2. Genus Liliatrema Gubanov, 1953
   3. Genus Pricetrema Ciurea, 1933
3. Subfamily Cryptocotylinae Lühe, 1909
   1. Genus Cryptocotyle Lühe, 1899
   2. Genus Scaphanocephalus Jägerskiöld, 1904
4. Subfamily Delphinicolinae Yamaguti, 1933
   1. Genus Delphinicola Yamaguti, 1933
5. Subfamily Diasiellinae Yamaguti, 1958
   1. Genus Diasiella Travassos, 1949
   2. Genus Diasia Travassos, 1922 accepted as Diasiella Travassos, 1949 (pre-occupied and renamed)
6. Subfamily Euryhelminthinae Morozov, 1950
   1. Genus Euryhelmis Poche, 1926
7. Subfamily Metorchiinae Lühe, 1909
   1. Genus Cladocystis Poche, 1926
   2. Genus Holometra Looss, 1899
   3. Genus Metorchis Looss, 1899
   4. Genus Parametorchis Skrjabin, 1913
   5. Genus Allometorchis Baer, 1944 accepted as Parametorchis Skrjabin, 1913 (unaccepted > junior subjective synonym)
   6. Genus Metametorchis Morozov, 1939 accepted as Parametorchis Skrjabin, 1913 (unaccepted > junior subjective synonym)
8. Subfamily Microtrematinae Filimonova, 2000
   1. Genus Microtrema Kobayashi, 1915
9. Subfamily Oesophagicolinae Yamaguti, 1933
   1. Genus Oesophagicola Yamaguti, 1933
10. Subfamily Opisthorchiinae Looss, 1899
    1. Genus Amphimerus Barker, 1911
    2. Genus Clonorchis Looss, 1907
    3. Genus Cyclorchis Lühe, 1908
    4. Genus Erschoviorchis Skrjabin, 1945
    5. Genus Euamphimerus Yamaguti, 1941
    6. Genus Evranorchis Skrjabin, 1944
    7. Genus Gomtia Thapar, 1930
    8. Genus Nigerina Baugh, 1958
    9. Genus Opisthorchis Blanchard, 1895
    10. Genus Paropisthorchis Stephens, 1912
    11. Genus Pseudamphimerus Gower, 1940
    12. Genus Thaparotrema Gupta, 1955
    13. Genus Trionychotrema Jin & Zhang, 1981
    14. Genus Agrawalotrema Sahay & Sahay, 1988 accepted as Thaparotrema Gupta, 1955 (unaccepted > junior subjective synonym)
    15. Genus Neometorchis Bilqees, Shabbir & Parveen, 2003 accepted as Opisthorchis Blanchard, 1895 (unaccepted > junior subjective synonym)
    16. Genus Notaulus Skrjabin, 1913 accepted as Opisthorchis Blanchard, 1895 (unaccepted > junior subjective synonym)
    17. Genus Pseudogomptiotrema Gupta & Jain, 1991 accepted as Gomtia Thapar, 1930 (synonym)
11. Subfamily Pachytrematinae Railliet, 1919
    1. Genus Pachytrema Looss, 1907
    2. Genus Multivitellaria Phadke & Gulati, 1929 accepted as Pachytrema Looss, 1907 (unaccepted > junior subjective synonym)
12. Subfamily Plotnikoviinae Skrjabin, 1945
    1. Genus Plotnikovia Skrjabin, 1945
13. Subfamily Pseudamphistominae Yamaguti, 1958
    1. Genus Pseudamphistomum Lühe, 1908
14. Subfamily Ratziinae Poche, 1926
    1. Genus Ratzia Poche, 1926
    2. Genus Brachymetra Stossich, 1904 accepted as Ratzia Poche, 1926 (unaccepted > junior homonym, preoccupied by Brachymetra Mayr, 1865)
15. Subfamily Tubangorchiinae Yamaguti, 1958
    1. Genus Tubangorchis Skrjabin, 1944
16. Subfamily Witenbergiinae Scholz, 2008
    1. Genus Witenbergia Vaz, 1932
17. Genus Gomtiotrema Gupta, 1955 nec Sinha, 1934 accepted as Allogomtiotrema Yamaguti, 1958 (preoccupied)
18. Genus Hepatiarius Feizullaev, 1961 accepted as Opisthorchis Blanchard, 1895 (unaccepted > junior subjective synonym)
19. Subfamily Holometrinae Filimonova, 2000 accepted as Opisthorchiinae Looss, 1899 (unaccepted > junior subjective synonym)
20. Subfamily Liliatrematinae Gubanov, 1953 accepted as Apophallinae Ciurea, 1924 (unaccepted > junior subjective synonym)
21. Genus Minuthorchis Linton, 1928 accepted as Pachytrema Looss, 1907 (unaccepted > junior subjective synonym)
22. Subfamily Pseudamphimerinae Skrjabin & Petrov, 1950 accepted as Opisthorchiinae Looss, 1899 (unaccepted > junior subjective synonym)
23. Subfamily Astiotrematinae Baer, 1924 (uncertain > taxon inquirendum, Incertae sedis)
    1. Genus Astiotrema Looss, 1900
    2. Genus Homeoastiotrema Karar, Blend, Dronan & Adel, 2023
    3. Genus Ichthyastiotrema Karar, Blend, Dronan & Adel, 2023
    4. Genus Longigula Qiu, Zhang & Li, 1983
    5. Genus Plesioastiotrema Karar, Blend, Dronan & Adel, 2023
    6. Genus Astia Looss, 1899 accepted as Astiotrema Looss, 1900 (unaccepted > junior homonym, Pre-occupied)
    7. Genus Astioglossimetra Bilqees, Khatoon & Khan, 2002 accepted as Astiotrema Looss, 1900 (unaccepted > junior subjective synonym)

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