Athyma zeroca, the small staff sergeant, is a species of nymphalid butterfly found in tropical and subtropical Asia.

Male upperside superficially resembles the upperside of Athyma selenophora; but on the forewing the discoidal streak is more obscure, the three obliquely placed white spots composing the anterior portion of the discal band are pre-apically transverse on the wing and are sometimes not white but fuliginous brown; the postdiscal and subterminal lines on the hindwing are more continuous.

Underside also resembles, but more closely, the underside of A. selenophora male, but the ground colour is darker, the discoidal streak and transverse preapical spots on the forewing and the postdiscal and subterminal lines on the hindwing lilac, the latter two more continuous, not macular.

Upperside fuliginous brown with diffuse sullied white markings.

Underside ochraceous brown, the sullied white markings as on the upperside, a series of dark ferruginous diffuse marks resembling stains from near apex of forewing to dorsal margin of hindwing; this last broadly bluish.