The scarce bamboo page or dido longwing (Philaethria dido) is a butterfly in the family Nymphalidae. It is found in Central America and tropical South America, both east and west of the Andes, from Brazil and Ecuador northwards to Mexico. Strays can sometimes be found in the lower Rio Grande Valley in southern Texas.

The butterflies have a wingspan of about 110 mm (4.3 in), and in Mexico are on the wing from July to December. The upper surface of the wings is black patterned with translucent green patches. The underside is similar with some brown streaks with gray scales;