Bothragonus occidentalis is a fish in the family Agonidae.

[1] It was described by Georgii Ustinovich Lindberg in 1935.

[2] It is a marine, temperate water-dwelling fish which is known from the northwestern Pacific Ocean, including Japan and Peter the Great Bay.

It is known to dwell at a depth range of 0–100 metres.

Males can reach a maximum total length of 7 centimetres.