The rose-bellied bunting or Rosita's bunting (Passerina rositae) is a species of bird in the family Cardinalidae, the cardinals or cardinal grosbeaks. It is endemic to a very small area of southern Mexico.

The rose-bellied bunting is 13.5 to 14.5 cm (5.3 to 5.7 in) long and weighs 19.5 to 20.5 g (0.69 to 0.72 oz). The adult male's crown is purplish-blue, and it is electric blue on the rest of its upperparts that fades from darker to lighter towards the tail. Its chin is grayish, the throat and chest blue, and the belly and vent area salmon pink. The adult female's head and upperparts are gray-brown with a bluish tinge at the rump. Its undersides are pinkish buff, warmer on the throat becoming paler towards the lower belly.