Nematalosa flyensis, the Fly River gizzard or Fly River gizzard shad, is a species of freshwater ray-finned fish within the family Clupeidae.

[1][2] The species is endemic to New Guinea, and is only known to inhabit the Fly River, including its tributary Strickland River.

[2] Individuals are known to grow as big as 22.2 cm (8.7 in) in standard length.

[1][2] Nematalosa flyensis has been classified as 'Data deficient' by the IUCN Red List.

Little is known about the population and threats of the species, and since its endemic to a single river system it could be susceptible to degradation, droughts, algal blooms and fishing, although whether these greatly impact the species is unknown.