Coptotomus is a genus of predaceous diving beetles in the family Dytiscidae, the only genus of the subfamily Coptotominae. There are about six described species in Coptotomus, found in North America and the Neotropics.
There is one extinct species from the Palearctic.
Species These six species belong to the genus Coptotomus: †Coptotomus balticus Hendrich and Balke, 2020 Coptotomus difficilis LeConte, 1852 Coptotomus interrogatus (Fabricius, 1801) Coptotomus longulus LeConte, 1852 Coptotomus loticus Hilsenhoff, 1980 Coptotomus serripalpus Say, 1830 Coptotomus venustus (Say, 1823)
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