Hydrophilus is a genus of beetles in the family Hydrophilidae, the water scavenger beetles. There are 53 species in three subgenera in the genus: Hydrophilus, Dibolocelus, and Temnopterus.

List of species Subgenus Dibolocelus Hydrophilus gibbosus (Régimbart, 1901) Hydrophilus harpe Short and McIntosh, 2015 Hydrophilus iricolor (Régimbart, 1901) Hydrophilus masculinus (Régimbart, 1901) Hydrophilus nucleoensis Arce-Pérez & Arriaga-Varela, 2021 Hydrophilus oberthueri (Régimbart, 1901) Hydrophilus ovatus Gemminger and Harold 1868 Hydrophilus palpalis Brullé, 1838 Hydrophilus pollens Sharp, 1887 Hydrophilus pseudovatus Arce-Pérez & Arriaga-Varela, 2021 Hydrophilus purpuracens (Régimbart, 1901) Hydrophilus smaragdinus Brullé, 1837 Hydrophilus violaceonitens Jacquelin du Val, 1857 Subgenus Hydrophilus Hydrophilus acuminatus Motschulsky, 1853 Hydrophilus albipes Castelnau, 1840 Hydrophilus aterrimus (Eschscholtz, 1822) Hydrophilus australis Montrouzier, 1860 Hydrophilus bedeli (Régimbart, 1901) Hydrophilus bilineatus (MacLeay, 1825) Hydrophilus brevispina Fairmaire, 1879 Hydrophilus cavicrus (Kuwert, 1893) Hydrophilus cavisternum (Bedel, 1891) Hydrophilus dauricus Mannerheim, 1852 Hydrophilus ensifer Brullé, 1837 Hydrophilus flavicornis Castelnau, 1840 Hydrophilus foveolatus (Régimbart, 1901) Hydrophilus guarani (Bachmann, 1966) Hydrophilus hackeri (Orchymont, 1937) Hydrophilus hastatus (Herbst, 1779) Hydrophilus indicus (Bedel, 1891) Hydrophilus infrequens Watts, 1988 Hydrophilus insularis Laporte de Castelnau, 1840 Hydrophilus latipalpus Castelnau, 1840 Hydrophilus loriai (Régimbart, 1901) Hydrophilus macronyx (Régimbart, 1901) Hydrophilus mesopotamiae (Kniz, 1914) Hydrophilus novaeguineae Watts, 1988 Hydrophilus olivaceus Fabricius, 1781 Hydrophilus pedipalpus (Bedel, 1891) Hydrophilus piceus (Linnaeus, 1758) – great silver water beetle Hydrophilus pistaceus Laporte de Castelnau, 1840 Hydrophilus regimbarti (Zaitzev, 1908) Hydrophilus rufocinctus (Bedel, 1891) Hydrophilus senegalensis (Percheron, 1835) Hydrophilus simulator (Bedel, 1891) Hydrophilus sternitalis (Reitter, 1906) Hydrophilus temnopteroides (Orchymont, 1913) Hydrophilus triangularis Say, 1823 – giant water scavenger beetle Hydrophilus unguicularis (Régimbart, 1901) Hydrophilus wattsi Hansen, 1999 Subgenus Temnopterus Hydrophilus aculeatus (Solier, 1834) Hydrophilus rufomarginatus Hansen, 1999

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