Priacanthus hamrur, the lunar-tailed bigeye, goggle eye, or moontail bullseye, is a species of marine fishes belonging to the family Priacanthidae.

[4] Priacanthus hamrur is a reef-associated species, living in tropical marine waters on outer reef slopes and rocky areas and in lagoons at depths of 8 to 250 meters, but most commonly from 30 to 50 m.[2][1] At sexual maturity the size of Priacanthus hamrur reaches 18–19 cm (7.1–7.5 in) in males, 19.1–20.0 cm (7.5–7.9 in) in females,[1] but males can reach a maximum length of 45 cm.

The mouth is oblique with a protruding lower jaw and small conical teeth.

[2] This species is rather similar and can be confused with Priacanthus blochii and with Heteropriacanthus cruentatus.

[5] These fishes usually live solitary, but the may also form small aggregations and sometimes large schools in the open waters.