The Fueguian sprat or Falkland sprat (Sprattus fuegensis) is a herring-like, marine fish in the family Clupeidae found in the subtropical southwest Atlantic Ocean from 40° S to Tierra del Fuego and the Falkland Islands.

The Fueguian sprat has a lower jaw slightly projecting, and a gill cover without bony radiating striae.

The last two anal fin rays are not enlarged, and there are no dark spots on the flanks.

It is a schooling species found in coastal waters, and a food item of hakes, sea birds and seals in Patagonian Falkland waters.

Coloration is dark blue dorsally and silvery white laterally and ventrally, and all fins are translucent.