The blue corydoras or Natterer's catfish (Corydoras nattereri) is a tropical freshwater fish belonging to the subfamily Corydoradinae of the family Callichthyidae.

It originates in coastal rivers in South America, and is found in the Brazil from Espírito Santo to Paraná.

General color of the body is light, tending towards yellow.

It feeds on worms, benthic crustaceans, insects, and plant matter.

The blue corydoras is of commercial importance in the aquarium trade industry.