Agonomalus jordani is a fish in the family Agonidae (poachers). It was described by David Starr Jordan and Edwin Chapin Starks in 1904. It is a marine, temperate water-dwelling fish which is known from the northwestern Pacific Ocean, including Japan, the Sea of Japan, and Sakhalin. It dwells at a depth range of 10 to 105 metres (33 to 344 ft). Males can reach a maximum total length of 18 centimetres (7.1 in), but more commonly reach a TL of 11 centimetres (4.3 in).