Ladigesia is monospecific genus of freshwater ray-finned fish belonging to the family Alestidae, the African tetras. The only species in the genus is Ladigesia roloffi, the Sierra Leone dwarf characin, is a species that is found in Sierra Leone and Liberia, Africa. The fish was named in honor of German aquarist Erhard Roloff (1903–1980), who collected the type specimen. They are a social species generally living in schools at mid depths and surface level fresh water. It lives for five years. Ninety-seven percent of their natural habitat has been lost.

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