Petrocephalus steindachneri is a species of electric fish in the family Mormyridae. It is native to the Rufuji River system in Tanzania.
This species reaches a length of .
The fish was named after Austrian ichthyologist Franz Steindachner (1834âÂÂ1919), who had described this species in 1914 but used a preoccupied name, P. affinis <small>Sauvage 1879</small> (Stomatorhinus walkeri).