Acestrorhynchus britskii is a species of freshwater ray-finned fish belonging to the family Acestrorhynchidae, the freshwater barracudas. It was described by Naércio Aquino de Menezes in 1969. It inhabits the São Francisco river in Brazil. It reaches a maximum standard length of .
The fish is named in honor of ichthyologist Heraldo A. Britski with the Departamento de Zoologia, Secretaria de Agricultura, in São Paulo, Brazil, who collected the type specimen.