Caligus is a genus of sea lice in the family Caligidae. The species are parasites of marine fishes and could be vectors of viruses. , the World Register of Marine Species includes the following species: Caligus absens Ho, Lin & Chen, 2000 Caligus acanthopagri Lin, Ho & Chen, 1994 Caligus aduncus Shen & Li, 1959 Caligus aesopus C. B. Wilson, 1921 Caligus affinis Heller, 1866 Caligus afurcatus C. B. Wilson, 1913 Caligus alaihi A. G. Lewis, 1968 Caligus amblygenitalis Pillai, 1961 Caligus antennatus Boxshall & Gurney, 1980 Caligus apodus (Brian, 1924) Caligus arii Bassett-Smith, 1898 Caligus ariicolus C. B. Wilson, 1928 Caligus asperimanus Pearse, 1951 Caligus asymmetricus Kabata, v Caligus atromaculatus C. B. Wilson, 1913 Caligus balistae Steenstrup & Lütken, 1861 Caligus belones Krøyer, 1863 Caligus berychis C. B. Wilson, 1935 Caligus biaculeatus Brian, 1914 Caligus bicycletus Heegaard, 1945 Caligus bifurcus Shen, 1958 Caligus biseriodentatus Shen, 1957 Caligus bocki Heegaard, 1943 Caligus bonito C. B. Wilson, 1905 Caligus brevicaudatus A. Scott, 1901 Caligus brevicaudus Pillai, 1963 Caligus brevipedis Bassett-Smith, 1896 Caligus brevis Shiino, 1954 Caligus buechlerae Hewitt, 1964 Caligus callaoensis Duran, 1980 Caligus callyodoni Prabha & Pillai, 1986 Caligus calotomi Shiino, 1954 Caligus carangis Krøyer, 1863 Caligus centrodonti Baird, 1850 Caligus chamelensis Caligus cheilodactyli Krøyer, 1863 Caligus chelifer C. B. Wilson, 1905 Caligus chiastos Lin & Ho, 2003 Caligus chorinemi Krøyer, 1863 Caligus chrysophrysi Pillai, 1985 Caligus clavatus Kirtisinghe, 1964 Caligus clemensi Parker & Margolis, 1964 Caligus confusus Pillai, 1961 Caligus constrictus Heller, 1865 Caligus cookeoli Ho & Lin, 2010 Caligus cordiventris Shiino, 1952 Caligus cordyla Pillai, 1963 Caligus cornutus Heegaard, 1962 Caligus coryphaenae Steenstrup & Lütken, 1861 Caligus cossacki Bassett-Smith, 1898 Caligus costatus Shen & Li, 1959 Caligus cresseyorum Kabata, 1992 Caligus crusmae Castro-Romero & Baeza-Kuroki, 1982 Caligus cunicephalus Gnanamuthu, 1950 Caligus curtus O. F. Müller, 1785 Caligus cybii Bassett-Smith, 1898 Caligus dactylopteni Uma Devi & Shyamasundari, 1981 Caligus dakari Beneden, 1892 Caligus dampieri Byrnes T., 1987 Caligus dasyaticus Rangnekar, 1957 Caligus debueni Stuardo & Fagetti, 1961 Caligus deformis Brian, 1924 Caligus diaphanus von Nordmann, 1832 Caligus dicentrarchi Cabral & Raibaut, 1986 Caligus dieuzeidei Brian, 1933 Caligus digitatus Ho & Lin, 2003 Caligus dubius T. Scott, 1894 Caligus eleutheronemi Shen, 1957 Caligus elongatus von Nordmann, 1832 Caligus engraulidis Barnard, 1948 Caligus enormis C. B. Wilson, 1913 Caligus epidemicus Hewitt, 1971 Caligus epinepheli Yamaguti, 1936 Caligus equulae Ho & Lin, 2003 Caligus evelynae Suárez-Morales, Camisotti & Martín, 2012 Caligus eventilis