Abudefduf septemfasciatus, commonly known as the banded sergeant, is a species of damselfish in the family Pomacentridae.

The species is native to the Indo-Pacific and can reach 23 cm (9.1 in) in total length.

[2] Abudefduf septemfasciatus is a non-migratory marine fish associated with lagoons and coral reefs found at depths of 0 to 3 m (0 to 10 ft).

It is oviparous, with individuals forming distinct pairs during breeding and males guarding and aerating eggs.

[2] Abudefduf septemfasciatus occurs in the Indo-Pacific, where it ranges from East Africa to the Line and Tuamotu Islands, north to southern Japan, and south to the southern Great Barrier Reef.