The Orange-bellied Parrot is just bigger than a Budgerigar, with males and females varying slightly in appearance. The male is a bright grass-green on the head, back and most of the wings, fading to a yellowish-green on throat and breast, to bright yellow to the vent and under the tail. The belly has a bright orange patch, and there is a deep blue band between the eyes, bordered above by a faint blue line. The male also has bright blue on the bend of the wings. The female is duller, with less blue and has a smaller orange belly patch. Both male and females have a greyish-black bill, a dark-brown eye and greyish-brown legs.