Agonopsis chiloensis, the snailfish, is a fish in the family Agonidae. It was described by Leonard Jenyns in 1840. It is a subtropical, marine fish which is known from the southeastern Pacific and southwestern Atlantic Ocean, including Chile, Patagonia, and Argentina. It is known to dwell at a depth range of 3–400 metres. Males can reach a maximum standard length of 12.5 centimetres.

Agonopsis chiloensis is preyed upon by Cottoperca gobio, imperial shag, Pinguipes chilensis, and the narrowmouthed catshark. It is of no commercial interest to fisheries.

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