Charaxes bernardus, the tawny rajah, is a butterfly that belongs to the rajahs and nawabs group, that is, the Charaxinae group of the brush-footed butterflies family. This species can be found in India, China, Indomalaya, and onwards to Indonesia.

Charaxes bernardus has a wingspan of about 7 - 9 cm. The upperside of wings is reddish brown or pale brown-orange, with dark brown/black speckles at the wings tips and small black marks at the margin of the hindwings. On the underside of the wings there are irregular wavy or tawny brown speckles and whitish zigzag bands. Males and females are very similar in appearance.

It has been recorded as a migrant in South India and is known to mud-puddle.

Known food plants of this species include: Aglaia lawii, Aglaia roxburghiana (Meliaceae), Cinnamomum camphora, Litsea glutinosa, Litsea populifolia (Lauraceae), Sapium sebiferum (Euphorbiaceae), Adenanthera pavonina, Paraserianthes falcataria (= Falcataria moluccana), Tamarindus indica (Leguminosae), and Acronychia penduculata (Rutaceae).