Megadytes is a mainly Neotropical genus of large diving beetles in family Dytiscidae. It contains the following species:
Megadytes aubei (Wilke, 1920)
Megadytes australis (Germain, 1854)
Megadytes carcharias Griffini, 1895
Megadytes ducalis Sharp, 1882
Megadytes ecuadorius Zimmermann, 1919
Megadytes fallax (Aubé, 1838)
Megadytes flohri Sharp, 1882
Megadytes fraternus Sharp, 1882
Megadytes glaucus (Brullé, 1837)
Megadytes gravidus Sharp, 1882
Megadytes guayanensis (Wilke, 1920)
Megadytes guignoti Mouchamps, 1957
Megadytes laevigatus (Olivier, 1795)
Megadytes latus (Fabricius, 1801)
Megadytes lherminieri (Guérin-Méneville, 1829)
Megadytes magnus Trémouilles & Bachmann, 1980
Megadytes marginithorax (Perty, 1830)
Megadytes nicoleti (Heer, 1862)
Megadytes obesus Sharp, 1882
Megadytes perplexus Sharp, 1882
Megadytes robustus (Aubé, 1838)
Megadytes steinheili (Wehncke, 1876)
