Klausewitzia is a monospecific genus of freshwater ray-finned fish belonging to the family Crenuchidae, the South American darters. The only species in this genus is Klausewitzia ritae, a fish found in the upper Amazon basin in the frontier zone of Brazil and Peru.
The fish is named in honor of Rita Klausewitz (d. 1995), the wife of ichthyologist Wolfgang Klausewitz.